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[PATCH 4.0 00/58] 4.0.9-stable review

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  [PATCH 4.0 00/58] 4.0.9-stable review Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-07-19 21:20 +0200
    [PATCH 4.0 36/58] regmap: Fix possible shift overflow in regmap_field_init() Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-07-19 21:20 +0200
    [PATCH 4.0 57/58] of/pci: Fix pci_address_to_pio() conversion of CPU address to I/O port Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-07-19 21:20 +0200
    [PATCH 4.0 35/58] regmap: Fix regmap_bulk_read in BE mode Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-07-19 21:20 +0200
    [PATCH 4.0 22/58] tools selftests: Fix clean target with make 3.81 Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-07-19 21:20 +0200
    [PATCH 4.0 09/58] sysfs: Create mountpoints with sysfs_create_mount_point Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-07-19 21:20 +0200
    [PATCH 4.0 20/58] ACPI / PM: Add missing pm_generic_complete() invocation Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-07-19 21:20 +0200
    [PATCH 4.0 33/58] mm, thp: respect MPOL_PREFERRED policy with non-local node Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-07-19 21:20 +0200
    [PATCH 4.0 24/58] ARC: add compiler barrier to LLSC based cmpxchg Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-07-19 21:20 +0200
    [PATCH 4.0 44/58] scsi_transport_srp: Fix a race condition Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-07-19 21:20 +0200
    [PATCH 4.0 19/58] ACPI / init: Switch over platform to the ACPI mode later Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-07-19 21:20 +0200
    [PATCH 4.0 32/58] mm: kmemleak_alloc_percpu() should follow the gfp from per_alloc() Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-07-19 21:20 +0200
    [PATCH 4.0 31/58] mm: kmemleak: allow safe memory scanning during kmemleak disabling Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-07-19 21:20 +0200
    [PATCH 4.0 18/58] ALSA: hda - Fix the dock headphone output on Fujitsu Lifebook E780 Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-07-19 21:20 +0200
    [PATCH 4.0 23/58] ARC: add smp barriers around atomics per Documentation/atomic_ops.txt Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-07-19 21:20 +0200
    [PATCH 4.0 07/58] mnt: Refactor the logic for mounting sysfs and proc in a user namespace Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-07-19 21:20 +0200
    [PATCH 4.0 26/58] mei: txe: reduce suspend/resume time Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-07-19 21:20 +0200
    [PATCH 4.0 15/58] ALSA: hda - Fix Dock Headphone on Thinkpad X250 seen as a Line Out Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-07-19 21:20 +0200
    [PATCH 4.0 29/58] arm64: mm: Fix freeing of the wrong memmap entries with !SPARSEMEM_VMEMMAP Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-07-19 21:20 +0200
    [PATCH 4.0 30/58] arm64: vdso: work-around broken ELF toolchains in Makefile Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-07-19 21:20 +0200
    [PATCH 4.0 25/58] mei: me: wait for power gating exit confirmation Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-07-19 21:20 +0200
    [PATCH 4.0 27/58] arm64: Do not attempt to use init_mm in reset_context() Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-07-19 21:20 +0200
    [PATCH 4.0 28/58] arm64: entry: fix context tracking for el0_sp_pc Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-07-19 21:20 +0200
    [PATCH 4.0 21/58] iio: accel: kxcjk-1013: add the "KXCJ9000" ACPI id Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-07-19 21:20 +0200
    [PATCH 4.0 17/58] ALSA: hda - Add headset support to Acer Aspire V5 Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-07-19 21:20 +0200
    [PATCH 4.0 08/58] mnt: Modify fs_fully_visible to deal with locked ro nodev and atime Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-07-19 21:20 +0200
    [PATCH 4.0 16/58] ALSA: hda - set proper caps for newer AMD hda audio in KB/KV Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-07-19 21:20 +0200
    [PATCH 4.0 58/58] Input: pixcir_i2c_ts - fix receive error Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-07-19 21:20 +0200
    [PATCH 4.0 02/58] sysctl: Allow creating permanently empty directories that serve as mountpoints. Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-07-19 21:30 +0200
    [PATCH 4.0 39/58] livepatch: add module locking around kallsyms calls Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-07-19 21:30 +0200
    [PATCH 4.0 55/58] PCI: Add pci_bus_addr_t Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-07-19 21:30 +0200
    [PATCH 4.0 41/58] spi: orion: Fix maximum baud rates for Armada 370/XP Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-07-19 21:30 +0200
    [PATCH 4.0 52/58] mtd: fix: avoid race condition when accessing mtd->usecount Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-07-19 21:30 +0200
    [PATCH 4.0 14/58] ALSA: pcm: Fix pcm_class sysfs output Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-07-19 21:30 +0200
    [PATCH 4.0 38/58] regulator: core: fix constraints output buffer Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-07-19 21:30 +0200
    [PATCH 4.0 05/58] sysfs: Add support for permanently empty directories to serve as mount points. Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-07-19 21:30 +0200
    [PATCH 4.0 12/58] ipr: Increase default adapter init stage change timeout Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-07-19 21:30 +0200
    [PATCH 4.0 37/58] regulator: max77686: fix gpio_enabled shift wrapping bug Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-07-19 21:30 +0200
    [PATCH 4.0 47/58] IB/srp: Fix connection state tracking Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-07-19 21:30 +0200
    [PATCH 4.0 56/58] PCI: pciehp: Wait for hotplug command completion where necessary Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-07-19 21:30 +0200
    [PATCH 4.0 42/58] spi: pl022: Specify num-cs property as required in devicetree binding Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-07-19 21:30 +0200
    [PATCH 4.0 43/58] scsi_transport_srp: Introduce srp_wait_for_queuecommand() Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-07-19 21:30 +0200
    [PATCH 4.0 48/58] IB/srp: Fix reconnection failure handling Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-07-19 21:30 +0200
    [PATCH 4.0 45/58] IB/srp: Remove an extraneous scsi_host_put() from an error path Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-07-19 21:30 +0200
    [PATCH 4.0 03/58] proc: Allow creating permanently empty directories that serve as mount points Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-07-19 21:30 +0200
    [PATCH 4.0 13/58] Disable write buffering on Toshiba ToPIC95 Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-07-19 21:30 +0200
    [PATCH 4.0 46/58] IB/srp: Fix a connection setup race Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-07-19 21:30 +0200
    [PATCH 4.0 54/58] PCI: Propagate the "ignore hotplug" setting to parent Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-07-19 21:30 +0200
    [PATCH 4.0 04/58] kernfs: Add support for always empty directories. Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-07-19 21:30 +0200
    [PATCH 4.0 50/58] video: mxsfb: Make sure axi clock is enabled when accessing registers Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-07-19 21:30 +0200
    [PATCH 4.0 06/58] mnt: Update fs_fully_visible to test for permanently empty directories Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-07-19 21:30 +0200
    [PATCH 4.0 01/58] fs: Add helper functions for permanently empty directories. Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-07-19 21:30 +0200
    [PATCH 4.0 49/58] genirq: devres: Fix testing return value of request_any_context_irq() Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-07-19 21:30 +0200
    [PATCH 4.0 10/58] gpio: crystalcove: set IRQCHIP_SKIP_SET_WAKE for the irqchip Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-07-19 21:30 +0200
    [PATCH 4.0 51/58] leds / PM: fix hibernation on arm when gpio-led used with CPU led trigger Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-07-19 21:30 +0200
    Re: [PATCH 4.0 00/58] 4.0.9-stable review Shuah Khan <shuahkh@osg.samsung.com> - 2015-07-20 19:20 +0200

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#1187804 — [PATCH 4.0 42/58] spi: pl022: Specify num-cs property as required in devicetree binding

4.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>

commit ea6055c46eda1e19e02209814955e13f334bbe1b upstream.

Since commit 39a6ac11df65 ("spi/pl022: Devicetree support w/o platform data")
the 'num-cs' parameter cannot be passed through platform data when probing
with devicetree. Instead, it's a required devicetree property.

Fix the binding documentation so the property is properly specified.

Fixes: 39a6ac11df65 ("spi/pl022: Devicetree support w/o platform data")
Signed-off-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 Documentation/devicetree/bindings/spi/spi_pl022.txt |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/Documentation/devicetree/bindings/spi/spi_pl022.txt
+++ b/Documentation/devicetree/bindings/spi/spi_pl022.txt
@@ -4,9 +4,9 @@ Required properties:
 - compatible : "arm,pl022", "arm,primecell"
 - reg : Offset and length of the register set for the device
 - interrupts : Should contain SPI controller interrupt
+- num-cs : total number of chipselects
 
 Optional properties:
-- num-cs : total number of chipselects
 - cs-gpios : should specify GPIOs used for chipselects.
   The gpios will be referred to as reg = <index> in the SPI child nodes.
   If unspecified, a single SPI device without a chip select can be used.


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#1187805 — [PATCH 4.0 43/58] scsi_transport_srp: Introduce srp_wait_for_queuecommand()

4.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Bart Van Assche <bart.vanassche@sandisk.com>

commit be34c62ddf39d1931780b07a6f4241393e4ba2ee upstream.

Introduce the helper function srp_wait_for_queuecommand().
Move the definition of scsi_request_fn_active(). Add a comment
above srp_wait_for_queuecommand() that support for scsi-mq needs
to be added.

This patch does not change any functionality. A second call to
srp_wait_for_queuecommand() will be introduced in the next patch.

Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Cc: James Bottomley <JBottomley@Odin.com>
Cc: Sagi Grimberg <sagig@mellanox.com>
Cc: Sebastian Parschauer <sebastian.riemer@profitbricks.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/scsi/scsi_transport_srp.c |   54 +++++++++++++++++++++-----------------
 1 file changed, 31 insertions(+), 23 deletions(-)

--- a/drivers/scsi/scsi_transport_srp.c
+++ b/drivers/scsi/scsi_transport_srp.c
@@ -396,6 +396,36 @@ static void srp_reconnect_work(struct wo
 	}
 }
 
+/**
+ * scsi_request_fn_active() - number of kernel threads inside scsi_request_fn()
+ * @shost: SCSI host for which to count the number of scsi_request_fn() callers.
+ *
+ * To do: add support for scsi-mq in this function.
+ */
+static int scsi_request_fn_active(struct Scsi_Host *shost)
+{
+	struct scsi_device *sdev;
+	struct request_queue *q;
+	int request_fn_active = 0;
+
+	shost_for_each_device(sdev, shost) {
+		q = sdev->request_queue;
+
+		spin_lock_irq(q->queue_lock);
+		request_fn_active += q->request_fn_active;
+		spin_unlock_irq(q->queue_lock);
+	}
+
+	return request_fn_active;
+}
+
+/* Wait until ongoing shost->hostt->queuecommand() calls have finished. */
+static void srp_wait_for_queuecommand(struct Scsi_Host *shost)
+{
+	while (scsi_request_fn_active(shost))
+		msleep(20);
+}
+
 static void __rport_fail_io_fast(struct srp_rport *rport)
 {
 	struct Scsi_Host *shost = rport_to_shost(rport);
@@ -504,27 +534,6 @@ void srp_start_tl_fail_timers(struct srp
 EXPORT_SYMBOL(srp_start_tl_fail_timers);
 
 /**
- * scsi_request_fn_active() - number of kernel threads inside scsi_request_fn()
- * @shost: SCSI host for which to count the number of scsi_request_fn() callers.
- */
-static int scsi_request_fn_active(struct Scsi_Host *shost)
-{
-	struct scsi_device *sdev;
-	struct request_queue *q;
-	int request_fn_active = 0;
-
-	shost_for_each_device(sdev, shost) {
-		q = sdev->request_queue;
-
-		spin_lock_irq(q->queue_lock);
-		request_fn_active += q->request_fn_active;
-		spin_unlock_irq(q->queue_lock);
-	}
-
-	return request_fn_active;
-}
-
-/**
  * srp_reconnect_rport() - reconnect to an SRP target port
  * @rport: SRP target port.
  *
@@ -559,8 +568,7 @@ int srp_reconnect_rport(struct srp_rport
 	if (res)
 		goto out;
 	scsi_target_block(&shost->shost_gendev);
-	while (scsi_request_fn_active(shost))
-		msleep(20);
+	srp_wait_for_queuecommand(shost);
 	res = rport->state != SRP_RPORT_LOST ? i->f->reconnect(rport) : -ENODEV;
 	pr_debug("%s (state %d): transport.reconnect() returned %d\n",
 		 dev_name(&shost->shost_gendev), rport->state, res);


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#1187806 — [PATCH 4.0 48/58] IB/srp: Fix reconnection failure handling

4.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Bart Van Assche <bart.vanassche@sandisk.com>

commit a44074f14ba1ea0747ea737026eb929b81993dc3 upstream.

Although it is possible to let SRP I/O continue if a reconnect
results in a reduction of the number of channels, the current
code does not handle this scenario correctly. Instead of making
the reconnect code more complex, consider this as a reconnection
failure.

Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Cc: Sagi Grimberg <sagig@mellanox.com>
Cc: Sebastian Parschauer <sebastian.riemer@profitbricks.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/infiniband/ulp/srp/ib_srp.c |    5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

--- a/drivers/infiniband/ulp/srp/ib_srp.c
+++ b/drivers/infiniband/ulp/srp/ib_srp.c
@@ -1242,11 +1242,8 @@ static int srp_rport_reconnect(struct sr
 
 	for (i = 0; i < target->ch_count; i++) {
 		ch = &target->ch[i];
-		if (ret || !ch->target) {
-			if (i > 1)
-				ret = 0;
+		if (ret || !ch->target)
 			break;
-		}
 		ret = srp_connect_ch(ch, multich);
 		multich = true;
 	}


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#1187807 — [PATCH 4.0 45/58] IB/srp: Remove an extraneous scsi_host_put() from an error path

4.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Bart Van Assche <bart.vanassche@sandisk.com>

commit fb49c8bbaae70b14fea2b4590a90a21539f88526 upstream.

Fix a scsi_get_host() / scsi_host_put() imbalance in the error
path of srp_create_target(). See also patch "IB/srp: Avoid that
I/O hangs due to a cable pull during LUN scanning" (commit ID
34aa654ecb8e).

Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Reviewed-by: Sagi Grimberg <sagig@mellanox.com>
Cc: Sebastian Parschauer <sebastian.riemer@profitbricks.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/infiniband/ulp/srp/ib_srp.c |   13 +++++--------
 1 file changed, 5 insertions(+), 8 deletions(-)

--- a/drivers/infiniband/ulp/srp/ib_srp.c
+++ b/drivers/infiniband/ulp/srp/ib_srp.c
@@ -3171,11 +3171,11 @@ static ssize_t srp_create_target(struct
 
 	ret = srp_parse_options(buf, target);
 	if (ret)
-		goto err;
+		goto out;
 
 	ret = scsi_init_shared_tag_map(target_host, target_host->can_queue);
 	if (ret)
-		goto err;
+		goto out;
 
 	target->req_ring_size = target->queue_size - SRP_TSK_MGMT_SQ_SIZE;
 
@@ -3186,7 +3186,7 @@ static ssize_t srp_create_target(struct
 			     be64_to_cpu(target->ioc_guid),
 			     be64_to_cpu(target->initiator_ext));
 		ret = -EEXIST;
-		goto err;
+		goto out;
 	}
 
 	if (!srp_dev->has_fmr && !srp_dev->has_fr && !target->allow_ext_sg &&
@@ -3207,7 +3207,7 @@ static ssize_t srp_create_target(struct
 	spin_lock_init(&target->lock);
 	ret = ib_query_gid(ibdev, host->port, 0, &target->sgid);
 	if (ret)
-		goto err;
+		goto out;
 
 	ret = -ENOMEM;
 	target->ch_count = max_t(unsigned, num_online_nodes(),
@@ -3218,7 +3218,7 @@ static ssize_t srp_create_target(struct
 	target->ch = kcalloc(target->ch_count, sizeof(*target->ch),
 			     GFP_KERNEL);
 	if (!target->ch)
-		goto err;
+		goto out;
 
 	node_idx = 0;
 	for_each_online_node(node) {
@@ -3314,9 +3314,6 @@ err_disconnect:
 	}
 
 	kfree(target->ch);
-
-err:
-	scsi_host_put(target_host);
 	goto out;
 }
 


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#1187808 — [PATCH 4.0 03/58] proc: Allow creating permanently empty directories that serve as mount points

4.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: "Eric W. Biederman" <ebiederm@xmission.com>

commit eb6d38d5427b3ad42f5268da0f1dd31bb0af1264 upstream.

Add a new function proc_create_mount_point that when used to creates a
directory that can not be added to.

Add a new function is_empty_pde to test if a function is a mount
point.

Update the code to use make_empty_dir_inode when reporting
a permanently empty directory to the vfs.

Update the code to not allow adding to permanently empty directories.

Update /proc/openprom and /proc/fs/nfsd to be permanently empty directories.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 fs/proc/generic.c  |   23 +++++++++++++++++++++++
 fs/proc/inode.c    |    4 ++++
 fs/proc/internal.h |    6 ++++++
 fs/proc/root.c     |    4 ++--
 4 files changed, 35 insertions(+), 2 deletions(-)

--- a/fs/proc/generic.c
+++ b/fs/proc/generic.c
@@ -373,6 +373,10 @@ static struct proc_dir_entry *__proc_cre
 		WARN(1, "create '/proc/%s' by hand\n", qstr.name);
 		return NULL;
 	}
+	if (is_empty_pde(*parent)) {
+		WARN(1, "attempt to add to permanently empty directory");
+		return NULL;
+	}
 
 	ent = kzalloc(sizeof(struct proc_dir_entry) + qstr.len + 1, GFP_KERNEL);
 	if (!ent)
@@ -455,6 +459,25 @@ struct proc_dir_entry *proc_mkdir(const
 }
 EXPORT_SYMBOL(proc_mkdir);
 
+struct proc_dir_entry *proc_create_mount_point(const char *name)
+{
+	umode_t mode = S_IFDIR | S_IRUGO | S_IXUGO;
+	struct proc_dir_entry *ent, *parent = NULL;
+
+	ent = __proc_create(&parent, name, mode, 2);
+	if (ent) {
+		ent->data = NULL;
+		ent->proc_fops = NULL;
+		ent->proc_iops = NULL;
+		if (proc_register(parent, ent) < 0) {
+			kfree(ent);
+			parent->nlink--;
+			ent = NULL;
+		}
+	}
+	return ent;
+}
+
 struct proc_dir_entry *proc_create_data(const char *name, umode_t mode,
 					struct proc_dir_entry *parent,
 					const struct file_operations *proc_fops,
--- a/fs/proc/inode.c
+++ b/fs/proc/inode.c
@@ -423,6 +423,10 @@ struct inode *proc_get_inode(struct supe
 		inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
 		PROC_I(inode)->pde = de;
 
+		if (is_empty_pde(de)) {
+			make_empty_dir_inode(inode);
+			return inode;
+		}
 		if (de->mode) {
 			inode->i_mode = de->mode;
 			inode->i_uid = de->uid;
--- a/fs/proc/internal.h
+++ b/fs/proc/internal.h
@@ -191,6 +191,12 @@ static inline struct proc_dir_entry *pde
 }
 extern void pde_put(struct proc_dir_entry *);
 
+static inline bool is_empty_pde(const struct proc_dir_entry *pde)
+{
+	return S_ISDIR(pde->mode) && !pde->proc_iops;
+}
+struct proc_dir_entry *proc_create_mount_point(const char *name);
+
 /*
  * inode.c
  */
--- a/fs/proc/root.c
+++ b/fs/proc/root.c
@@ -182,10 +182,10 @@ void __init proc_root_init(void)
 #endif
 	proc_mkdir("fs", NULL);
 	proc_mkdir("driver", NULL);
-	proc_mkdir("fs/nfsd", NULL); /* somewhere for the nfsd filesystem to be mounted */
+	proc_create_mount_point("fs/nfsd"); /* somewhere for the nfsd filesystem to be mounted */
 #if defined(CONFIG_SUN_OPENPROMFS) || defined(CONFIG_SUN_OPENPROMFS_MODULE)
 	/* just give it a mountpoint */
-	proc_mkdir("openprom", NULL);
+	proc_create_mount_point("openprom");
 #endif
 	proc_tty_init();
 	proc_mkdir("bus", NULL);


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#1187809 — [PATCH 4.0 13/58] Disable write buffering on Toshiba ToPIC95

4.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Ryan Underwood <nemesis@icequake.net>

commit 2fb22a8042fe96b4220843f79241c116d90922c4 upstream.

Disable write buffering on the Toshiba ToPIC95 if it is enabled by
somebody (it is not supposed to be a power-on default according to
the datasheet). On the ToPIC95, practically no 32-bit Cardbus card
will work under heavy load without locking up the whole system if
this is left enabled. I tried about a dozen. It does not affect
16-bit cards. This is similar to the O2 bugs in early controller
revisions it seems.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=55961
Signed-off-by: Ryan C. Underwood <nemesis@icequake.net>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/pcmcia/topic.h |   16 ++++++++++++++++
 1 file changed, 16 insertions(+)

--- a/drivers/pcmcia/topic.h
+++ b/drivers/pcmcia/topic.h
@@ -104,6 +104,9 @@
 #define TOPIC_EXCA_IF_CONTROL		0x3e	/* 8 bit */
 #define TOPIC_EXCA_IFC_33V_ENA		0x01
 
+#define TOPIC_PCI_CFG_PPBCN		0x3e	/* 16-bit */
+#define TOPIC_PCI_CFG_PPBCN_WBEN	0x0400
+
 static void topic97_zoom_video(struct pcmcia_socket *sock, int onoff)
 {
 	struct yenta_socket *socket = container_of(sock, struct yenta_socket, socket);
@@ -138,6 +141,7 @@ static int topic97_override(struct yenta
 static int topic95_override(struct yenta_socket *socket)
 {
 	u8 fctrl;
+	u16 ppbcn;
 
 	/* enable 3.3V support for 16bit cards */
 	fctrl = exca_readb(socket, TOPIC_EXCA_IF_CONTROL);
@@ -146,6 +150,18 @@ static int topic95_override(struct yenta
 	/* tell yenta to use exca registers to power 16bit cards */
 	socket->flags |= YENTA_16BIT_POWER_EXCA | YENTA_16BIT_POWER_DF;
 
+	/* Disable write buffers to prevent lockups under load with numerous
+	   Cardbus cards, observed on Tecra 500CDT and reported elsewhere on the
+	   net.  This is not a power-on default according to the datasheet
+	   but some BIOSes seem to set it. */
+	if (pci_read_config_word(socket->dev, TOPIC_PCI_CFG_PPBCN, &ppbcn) == 0
+	    && socket->dev->revision <= 7
+	    && (ppbcn & TOPIC_PCI_CFG_PPBCN_WBEN)) {
+		ppbcn &= ~TOPIC_PCI_CFG_PPBCN_WBEN;
+		pci_write_config_word(socket->dev, TOPIC_PCI_CFG_PPBCN, ppbcn);
+		dev_info(&socket->dev->dev, "Disabled ToPIC95 Cardbus write buffers.\n");
+	}
+
 	return 0;
 }
 


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#1187810 — [PATCH 4.0 46/58] IB/srp: Fix a connection setup race

4.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Bart Van Assche <bart.vanassche@sandisk.com>

commit 8de9fe3a1d4ac8c3e4953fa4b7d81f863f5196ad upstream.

Avoid that receiving a DREQ while RDMA channels are being
established causes target->qp_in_error to be reset.

Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Cc: Sagi Grimberg <sagig@mellanox.com>
Cc: Sebastian Parschauer <sebastian.riemer@profitbricks.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/infiniband/ulp/srp/ib_srp.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/drivers/infiniband/ulp/srp/ib_srp.c
+++ b/drivers/infiniband/ulp/srp/ib_srp.c
@@ -992,8 +992,6 @@ static int srp_connect_ch(struct srp_rdm
 
 	WARN_ON_ONCE(!multich && target->connected);
 
-	target->qp_in_error = false;
-
 	ret = srp_lookup_path(ch);
 	if (ret)
 		return ret;
@@ -1242,6 +1240,9 @@ static int srp_rport_reconnect(struct sr
 		for (j = 0; j < target->queue_size; ++j)
 			list_add(&ch->tx_ring[j]->list, &ch->free_tx);
 	}
+
+	target->qp_in_error = false;
+
 	for (i = 0; i < target->ch_count; i++) {
 		ch = &target->ch[i];
 		if (ret || !ch->target) {


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#1187811 — [PATCH 4.0 54/58] PCI: Propagate the "ignore hotplug" setting to parent

4.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>

commit 0824965140fff1bf640a987dc790d1594a8e0699 upstream.

Refine the mechanism introduced by commit f244d8b623da ("ACPIPHP / radeon /
nouveau: Fix VGA switcheroo problem related to hotplug") to propagate the
ignore_hotplug setting of the device to its parent bridge in case hotplug
notifications related to the graphics adapter switching are given for the
bridge rather than for the device itself (they need to be ignored in both
cases).

Link: https://bugzilla.kernel.org/show_bug.cgi?id=61891
Link: https://bugs.freedesktop.org/show_bug.cgi?id=88927
Fixes: b440bde74f04 ("PCI: Add pci_ignore_hotplug() to ignore hotplug events for a device")
Reported-and-tested-by: tiagdtd-lava <tiagdtd-lava@yahoo.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/pci/pci.c   |   11 +++++++++++
 include/linux/pci.h |    6 +-----
 2 files changed, 12 insertions(+), 5 deletions(-)

--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -4319,6 +4319,17 @@ bool pci_device_is_present(struct pci_de
 }
 EXPORT_SYMBOL_GPL(pci_device_is_present);
 
+void pci_ignore_hotplug(struct pci_dev *dev)
+{
+	struct pci_dev *bridge = dev->bus->self;
+
+	dev->ignore_hotplug = 1;
+	/* Propagate the "ignore hotplug" setting to the parent bridge. */
+	if (bridge)
+		bridge->ignore_hotplug = 1;
+}
+EXPORT_SYMBOL_GPL(pci_ignore_hotplug);
+
 #define RESOURCE_ALIGNMENT_PARAM_SIZE COMMAND_LINE_SIZE
 static char resource_alignment_param[RESOURCE_ALIGNMENT_PARAM_SIZE] = {0};
 static DEFINE_SPINLOCK(resource_alignment_lock);
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1002,6 +1002,7 @@ int __must_check pci_assign_resource(str
 int __must_check pci_reassign_resource(struct pci_dev *dev, int i, resource_size_t add_size, resource_size_t align);
 int pci_select_bars(struct pci_dev *dev, unsigned long flags);
 bool pci_device_is_present(struct pci_dev *pdev);
+void pci_ignore_hotplug(struct pci_dev *dev);
 
 /* ROM control related routines */
 int pci_enable_rom(struct pci_dev *pdev);
@@ -1039,11 +1040,6 @@ bool pci_dev_run_wake(struct pci_dev *de
 bool pci_check_pme_status(struct pci_dev *dev);
 void pci_pme_wakeup_bus(struct pci_bus *bus);
 
-static inline void pci_ignore_hotplug(struct pci_dev *dev)
-{
-	dev->ignore_hotplug = 1;
-}
-
 static inline int pci_enable_wake(struct pci_dev *dev, pci_power_t state,
 				  bool enable)
 {


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#1187812 — [PATCH 4.0 04/58] kernfs: Add support for always empty directories.

4.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: "Eric W. Biederman" <ebiederm@xmission.com>

commit ea015218f2f7ace2dad9cedd21ed95bdba2886d7 upstream.

Add a new function kernfs_create_empty_dir that can be used to create
directory that can not be modified.

Update the code to use make_empty_dir_inode when reporting a
permanently empty directory to the vfs.

Update the code to not allow adding to permanently empty directories.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 fs/kernfs/dir.c        |   38 +++++++++++++++++++++++++++++++++++++-
 fs/kernfs/inode.c      |    2 ++
 include/linux/kernfs.h |    3 +++
 3 files changed, 42 insertions(+), 1 deletion(-)

--- a/fs/kernfs/dir.c
+++ b/fs/kernfs/dir.c
@@ -592,6 +592,9 @@ int kernfs_add_one(struct kernfs_node *k
 		goto out_unlock;
 
 	ret = -ENOENT;
+	if (parent->flags & KERNFS_EMPTY_DIR)
+		goto out_unlock;
+
 	if ((parent->flags & KERNFS_ACTIVATED) && !kernfs_active(parent))
 		goto out_unlock;
 
@@ -783,6 +786,38 @@ struct kernfs_node *kernfs_create_dir_ns
 	return ERR_PTR(rc);
 }
 
+/**
+ * kernfs_create_empty_dir - create an always empty directory
+ * @parent: parent in which to create a new directory
+ * @name: name of the new directory
+ *
+ * Returns the created node on success, ERR_PTR() value on failure.
+ */
+struct kernfs_node *kernfs_create_empty_dir(struct kernfs_node *parent,
+					    const char *name)
+{
+	struct kernfs_node *kn;
+	int rc;
+
+	/* allocate */
+	kn = kernfs_new_node(parent, name, S_IRUGO|S_IXUGO|S_IFDIR, KERNFS_DIR);
+	if (!kn)
+		return ERR_PTR(-ENOMEM);
+
+	kn->flags |= KERNFS_EMPTY_DIR;
+	kn->dir.root = parent->dir.root;
+	kn->ns = NULL;
+	kn->priv = NULL;
+
+	/* link in */
+	rc = kernfs_add_one(kn);
+	if (!rc)
+		return kn;
+
+	kernfs_put(kn);
+	return ERR_PTR(rc);
+}
+
 static struct dentry *kernfs_iop_lookup(struct inode *dir,
 					struct dentry *dentry,
 					unsigned int flags)
@@ -1254,7 +1289,8 @@ int kernfs_rename_ns(struct kernfs_node
 	mutex_lock(&kernfs_mutex);
 
 	error = -ENOENT;
-	if (!kernfs_active(kn) || !kernfs_active(new_parent))
+	if (!kernfs_active(kn) || !kernfs_active(new_parent) ||
+	    (new_parent->flags & KERNFS_EMPTY_DIR))
 		goto out;
 
 	error = 0;
--- a/fs/kernfs/inode.c
+++ b/fs/kernfs/inode.c
@@ -296,6 +296,8 @@ static void kernfs_init_inode(struct ker
 	case KERNFS_DIR:
 		inode->i_op = &kernfs_dir_iops;
 		inode->i_fop = &kernfs_dir_fops;
+		if (kn->flags & KERNFS_EMPTY_DIR)
+			make_empty_dir_inode(inode);
 		break;
 	case KERNFS_FILE:
 		inode->i_size = kn->attr.size;
--- a/include/linux/kernfs.h
+++ b/include/linux/kernfs.h
@@ -45,6 +45,7 @@ enum kernfs_node_flag {
 	KERNFS_LOCKDEP		= 0x0100,
 	KERNFS_SUICIDAL		= 0x0400,
 	KERNFS_SUICIDED		= 0x0800,
+	KERNFS_EMPTY_DIR	= 0x1000,
 };
 
 /* @flags for kernfs_create_root() */
@@ -285,6 +286,8 @@ void kernfs_destroy_root(struct kernfs_r
 struct kernfs_node *kernfs_create_dir_ns(struct kernfs_node *parent,
 					 const char *name, umode_t mode,
 					 void *priv, const void *ns);
+struct kernfs_node *kernfs_create_empty_dir(struct kernfs_node *parent,
+					    const char *name);
 struct kernfs_node *__kernfs_create_file(struct kernfs_node *parent,
 					 const char *name,
 					 umode_t mode, loff_t size,


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#1187813 — [PATCH 4.0 50/58] video: mxsfb: Make sure axi clock is enabled when accessing registers

4.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Liu Ying <Ying.Liu@freescale.com>

commit 2fa3b4c4a78a5db3502ab9e32630ea660ff923d0 upstream.

The LCDIF engines embedded in i.MX6sl and i.MX6sx SoCs need the axi clock
as the engine's system clock.  The clock should be enabled when accessing
LCDIF registers, otherwise the kernel would hang up.  We should also keep
the clock enabled when the engine is being active to scan out frames from
memory.  This patch makes sure the axi clock is enabled when accessing
registers so that the kernel hang up issue can be fixed.

Reported-by: Peter Chen <peter.chen@freescale.com>
Tested-by: Peter Chen <peter.chen@freescale.com>
Signed-off-by: Liu Ying <Ying.Liu@freescale.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/video/fbdev/mxsfb.c |   68 ++++++++++++++++++++++++++++++++++----------
 1 file changed, 54 insertions(+), 14 deletions(-)

--- a/drivers/video/fbdev/mxsfb.c
+++ b/drivers/video/fbdev/mxsfb.c
@@ -316,6 +316,18 @@ static int mxsfb_check_var(struct fb_var
 	return 0;
 }
 
+static inline void mxsfb_enable_axi_clk(struct mxsfb_info *host)
+{
+	if (host->clk_axi)
+		clk_prepare_enable(host->clk_axi);
+}
+
+static inline void mxsfb_disable_axi_clk(struct mxsfb_info *host)
+{
+	if (host->clk_axi)
+		clk_disable_unprepare(host->clk_axi);
+}
+
 static void mxsfb_enable_controller(struct fb_info *fb_info)
 {
 	struct mxsfb_info *host = to_imxfb_host(fb_info);
@@ -333,14 +345,13 @@ static void mxsfb_enable_controller(stru
 		}
 	}
 
-	if (host->clk_axi)
-		clk_prepare_enable(host->clk_axi);
-
 	if (host->clk_disp_axi)
 		clk_prepare_enable(host->clk_disp_axi);
 	clk_prepare_enable(host->clk);
 	clk_set_rate(host->clk, PICOS2KHZ(fb_info->var.pixclock) * 1000U);
 
+	mxsfb_enable_axi_clk(host);
+
 	/* if it was disabled, re-enable the mode again */
 	writel(CTRL_DOTCLK_MODE, host->base + LCDC_CTRL + REG_SET);
 
@@ -380,11 +391,11 @@ static void mxsfb_disable_controller(str
 	reg = readl(host->base + LCDC_VDCTRL4);
 	writel(reg & ~VDCTRL4_SYNC_SIGNALS_ON, host->base + LCDC_VDCTRL4);
 
+	mxsfb_disable_axi_clk(host);
+
 	clk_disable_unprepare(host->clk);
 	if (host->clk_disp_axi)
 		clk_disable_unprepare(host->clk_disp_axi);
-	if (host->clk_axi)
-		clk_disable_unprepare(host->clk_axi);
 
 	host->enabled = 0;
 
@@ -421,6 +432,8 @@ static int mxsfb_set_par(struct fb_info
 		mxsfb_disable_controller(fb_info);
 	}
 
+	mxsfb_enable_axi_clk(host);
+
 	/* clear the FIFOs */
 	writel(CTRL1_FIFO_CLEAR, host->base + LCDC_CTRL1 + REG_SET);
 
@@ -438,6 +451,7 @@ static int mxsfb_set_par(struct fb_info
 		ctrl |= CTRL_SET_WORD_LENGTH(3);
 		switch (host->ld_intf_width) {
 		case STMLCDIF_8BIT:
+			mxsfb_disable_axi_clk(host);
 			dev_err(&host->pdev->dev,
 					"Unsupported LCD bus width mapping\n");
 			return -EINVAL;
@@ -451,6 +465,7 @@ static int mxsfb_set_par(struct fb_info
 		writel(CTRL1_SET_BYTE_PACKAGING(0x7), host->base + LCDC_CTRL1);
 		break;
 	default:
+		mxsfb_disable_axi_clk(host);
 		dev_err(&host->pdev->dev, "Unhandled color depth of %u\n",
 				fb_info->var.bits_per_pixel);
 		return -EINVAL;
@@ -504,6 +519,8 @@ static int mxsfb_set_par(struct fb_info
 			fb_info->fix.line_length * fb_info->var.yoffset,
 			host->base + host->devdata->next_buf);
 
+	mxsfb_disable_axi_clk(host);
+
 	if (reenable)
 		mxsfb_enable_controller(fb_info);
 
@@ -582,10 +599,14 @@ static int mxsfb_pan_display(struct fb_v
 
 	offset = fb_info->fix.line_length * var->yoffset;
 
+	mxsfb_enable_axi_clk(host);
+
 	/* update on next VSYNC */
 	writel(fb_info->fix.smem_start + offset,
 			host->base + host->devdata->next_buf);
 
+	mxsfb_disable_axi_clk(host);
+
 	return 0;
 }
 
@@ -608,13 +629,17 @@ static int mxsfb_restore_mode(struct mxs
 	unsigned line_count;
 	unsigned period;
 	unsigned long pa, fbsize;
-	int bits_per_pixel, ofs;
+	int bits_per_pixel, ofs, ret = 0;
 	u32 transfer_count, vdctrl0, vdctrl2, vdctrl3, vdctrl4, ctrl;
 
+	mxsfb_enable_axi_clk(host);
+
 	/* Only restore the mode when the controller is running */
 	ctrl = readl(host->base + LCDC_CTRL);
-	if (!(ctrl & CTRL_RUN))
-		return -EINVAL;
+	if (!(ctrl & CTRL_RUN)) {
+		ret = -EINVAL;
+		goto err;
+	}
 
 	vdctrl0 = readl(host->base + LCDC_VDCTRL0);
 	vdctrl2 = readl(host->base + LCDC_VDCTRL2);
@@ -635,7 +660,8 @@ static int mxsfb_restore_mode(struct mxs
 		break;
 	case 1:
 	default:
-		return -EINVAL;
+		ret = -EINVAL;
+		goto err;
 	}
 
 	fb_info->var.bits_per_pixel = bits_per_pixel;
@@ -673,10 +699,14 @@ static int mxsfb_restore_mode(struct mxs
 
 	pa = readl(host->base + host->devdata->cur_buf);
 	fbsize = fb_info->fix.line_length * vmode->yres;
-	if (pa < fb_info->fix.smem_start)
-		return -EINVAL;
-	if (pa + fbsize > fb_info->fix.smem_start + fb_info->fix.smem_len)
-		return -EINVAL;
+	if (pa < fb_info->fix.smem_start) {
+		ret = -EINVAL;
+		goto err;
+	}
+	if (pa + fbsize > fb_info->fix.smem_start + fb_info->fix.smem_len) {
+		ret = -EINVAL;
+		goto err;
+	}
 	ofs = pa - fb_info->fix.smem_start;
 	if (ofs) {
 		memmove(fb_info->screen_base, fb_info->screen_base + ofs, fbsize);
@@ -689,7 +719,11 @@ static int mxsfb_restore_mode(struct mxs
 	clk_prepare_enable(host->clk);
 	host->enabled = 1;
 
-	return 0;
+err:
+	if (ret)
+		mxsfb_disable_axi_clk(host);
+
+	return ret;
 }
 
 static int mxsfb_init_fbinfo_dt(struct mxsfb_info *host,
@@ -915,7 +949,9 @@ static int mxsfb_probe(struct platform_d
 	}
 
 	if (!host->enabled) {
+		mxsfb_enable_axi_clk(host);
 		writel(0, host->base + LCDC_CTRL);
+		mxsfb_disable_axi_clk(host);
 		mxsfb_set_par(fb_info);
 		mxsfb_enable_controller(fb_info);
 	}
@@ -954,11 +990,15 @@ static void mxsfb_shutdown(struct platfo
 	struct fb_info *fb_info = platform_get_drvdata(pdev);
 	struct mxsfb_info *host = to_imxfb_host(fb_info);
 
+	mxsfb_enable_axi_clk(host);
+
 	/*
 	 * Force stop the LCD controller as keeping it running during reboot
 	 * might interfere with the BootROM's boot mode pads sampling.
 	 */
 	writel(CTRL_RUN, host->base + LCDC_CTRL + REG_CLR);
+
+	mxsfb_disable_axi_clk(host);
 }
 
 static struct platform_driver mxsfb_driver = {


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#1187815 — [PATCH 4.0 06/58] mnt: Update fs_fully_visible to test for permanently empty directories

4.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: "Eric W. Biederman" <ebiederm@xmission.com>

commit 7236c85e1be51a9e25ba0f6e087a66ca89605a49 upstream.

fs_fully_visible attempts to make fresh mounts of proc and sysfs give
the mounter no more access to proc and sysfs than if they could have
by creating a bind mount.  One aspect of proc and sysfs that makes
this particularly tricky is that there are other filesystems that
typically mount on top of proc and sysfs.  As those filesystems are
mounted on empty directories in practice it is safe to ignore them.
However testing to ensure filesystems are mounted on empty directories
has not been something the in kernel data structures have supported so
the current test for an empty directory which checks to see
if nlink <= 2 is a bit lacking.

proc and sysfs have recently been modified to use the new empty_dir
infrastructure to create all of their dedicated mount points.  Instead
of testing for S_ISDIR(inode->i_mode) && i_nlink <= 2 to see if a
directory is empty, test for is_empty_dir_inode(inode).  That small
change guaranteess mounts found on proc and sysfs really are safe to
ignore, because the directories are not only empty but nothing can
ever be added to them.  This guarantees there is nothing to worry
about when mounting proc and sysfs.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 fs/namespace.c |    5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -3196,9 +3196,8 @@ bool fs_fully_visible(struct file_system
 			/* Only worry about locked mounts */
 			if (!(mnt->mnt.mnt_flags & MNT_LOCKED))
 				continue;
-			if (!S_ISDIR(inode->i_mode))
-				goto next;
-			if (inode->i_nlink > 2)
+			/* Is the directory permanetly empty? */
+			if (!is_empty_dir_inode(inode))
 				goto next;
 		}
 		visible = true;


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#1187818 — [PATCH 4.0 01/58] fs: Add helper functions for permanently empty directories.

4.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: "Eric W. Biederman" <ebiederm@xmission.com>

commit fbabfd0f4ee2e8847bf56edf481249ad1bb8c44d upstream.

To ensure it is safe to mount proc and sysfs I need to check if
filesystems that are mounted on top of them are mounted on truly empty
directories.  Given that some directories can gain entries over time,
knowing that a directory is empty right now is insufficient.

Therefore add supporting infrastructure for permantently empty
directories that proc and sysfs can use when they create mount points
for filesystems and fs_fully_visible can use to test for permanently
empty directories to ensure that nothing will be gained by mounting a
fresh copy of proc or sysfs.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 fs/libfs.c         |   96 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 include/linux/fs.h |    2 +
 2 files changed, 98 insertions(+)

--- a/fs/libfs.c
+++ b/fs/libfs.c
@@ -1093,3 +1093,99 @@ simple_nosetlease(struct file *filp, lon
 	return -EINVAL;
 }
 EXPORT_SYMBOL(simple_nosetlease);
+
+
+/*
+ * Operations for a permanently empty directory.
+ */
+static struct dentry *empty_dir_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
+{
+	return ERR_PTR(-ENOENT);
+}
+
+static int empty_dir_getattr(struct vfsmount *mnt, struct dentry *dentry,
+				 struct kstat *stat)
+{
+	struct inode *inode = d_inode(dentry);
+	generic_fillattr(inode, stat);
+	return 0;
+}
+
+static int empty_dir_setattr(struct dentry *dentry, struct iattr *attr)
+{
+	return -EPERM;
+}
+
+static int empty_dir_setxattr(struct dentry *dentry, const char *name,
+			      const void *value, size_t size, int flags)
+{
+	return -EOPNOTSUPP;
+}
+
+static ssize_t empty_dir_getxattr(struct dentry *dentry, const char *name,
+				  void *value, size_t size)
+{
+	return -EOPNOTSUPP;
+}
+
+static int empty_dir_removexattr(struct dentry *dentry, const char *name)
+{
+	return -EOPNOTSUPP;
+}
+
+static ssize_t empty_dir_listxattr(struct dentry *dentry, char *list, size_t size)
+{
+	return -EOPNOTSUPP;
+}
+
+static const struct inode_operations empty_dir_inode_operations = {
+	.lookup		= empty_dir_lookup,
+	.permission	= generic_permission,
+	.setattr	= empty_dir_setattr,
+	.getattr	= empty_dir_getattr,
+	.setxattr	= empty_dir_setxattr,
+	.getxattr	= empty_dir_getxattr,
+	.removexattr	= empty_dir_removexattr,
+	.listxattr	= empty_dir_listxattr,
+};
+
+static loff_t empty_dir_llseek(struct file *file, loff_t offset, int whence)
+{
+	/* An empty directory has two entries . and .. at offsets 0 and 1 */
+	return generic_file_llseek_size(file, offset, whence, 2, 2);
+}
+
+static int empty_dir_readdir(struct file *file, struct dir_context *ctx)
+{
+	dir_emit_dots(file, ctx);
+	return 0;
+}
+
+static const struct file_operations empty_dir_operations = {
+	.llseek		= empty_dir_llseek,
+	.read		= generic_read_dir,
+	.iterate	= empty_dir_readdir,
+	.fsync		= noop_fsync,
+};
+
+
+void make_empty_dir_inode(struct inode *inode)
+{
+	set_nlink(inode, 2);
+	inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
+	inode->i_uid = GLOBAL_ROOT_UID;
+	inode->i_gid = GLOBAL_ROOT_GID;
+	inode->i_rdev = 0;
+	inode->i_size = 2;
+	inode->i_blkbits = PAGE_SHIFT;
+	inode->i_blocks = 0;
+
+	inode->i_op = &empty_dir_inode_operations;
+	inode->i_fop = &empty_dir_operations;
+}
+
+bool is_empty_dir_inode(struct inode *inode)
+{
+	return (inode->i_fop == &empty_dir_operations) &&
+		(inode->i_op == &empty_dir_inode_operations);
+}
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2721,6 +2721,8 @@ extern struct dentry *simple_lookup(stru
 extern ssize_t generic_read_dir(struct file *, char __user *, size_t, loff_t *);
 extern const struct file_operations simple_dir_operations;
 extern const struct inode_operations simple_dir_inode_operations;
+extern void make_empty_dir_inode(struct inode *inode);
+extern bool is_empty_dir_inode(struct inode *inode);
 struct tree_descr { char *name; const struct file_operations *ops; int mode; };
 struct dentry *d_alloc_name(struct dentry *, const char *);
 extern int simple_fill_super(struct super_block *, unsigned long, struct tree_descr *);


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#1187820 — [PATCH 4.0 49/58] genirq: devres: Fix testing return value of request_any_context_irq()

4.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Axel Lin <axel.lin@ingics.com>

commit 63781394c540dd9e666a6b21d70b64dd52bce76e upstream.

request_any_context_irq() returns a negative value on failure.
It returns either IRQC_IS_HARDIRQ or IRQC_IS_NESTED on success.
So fix testing return value of request_any_context_irq().

Also fixup the return value of devm_request_any_context_irq() to make it
consistent with request_any_context_irq().

Fixes: 0668d3065128 ("genirq: Add devm_request_any_context_irq()")
Signed-off-by: Axel Lin <axel.lin@ingics.com>
Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
Link: http://lkml.kernel.org/r/1431334978.17783.4.camel@ingics.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 kernel/irq/devres.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/kernel/irq/devres.c
+++ b/kernel/irq/devres.c
@@ -104,7 +104,7 @@ int devm_request_any_context_irq(struct
 		return -ENOMEM;
 
 	rc = request_any_context_irq(irq, handler, irqflags, devname, dev_id);
-	if (rc) {
+	if (rc < 0) {
 		devres_free(dr);
 		return rc;
 	}
@@ -113,7 +113,7 @@ int devm_request_any_context_irq(struct
 	dr->dev_id = dev_id;
 	devres_add(dev, dr);
 
-	return 0;
+	return rc;
 }
 EXPORT_SYMBOL(devm_request_any_context_irq);
 


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#1187821 — [PATCH 4.0 10/58] gpio: crystalcove: set IRQCHIP_SKIP_SET_WAKE for the irqchip

4.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Aaron Lu <aaron.lu@intel.com>

commit 61e749d7e1627d375156553ea0ae83c4f6bb5a9b upstream.

The CrystalCove GPIO irqchip doesn't have irq_set_wake callback defined
so we should set IRQCHIP_SKIP_SET_WAKE for it or it would cause an irq
desc's wake_depth unbalanced warning during system resume phase from the
gpio_keys driver, which is the driver for the power button of the ASUS
T100 laptop.

Signed-off-by: Aaron Lu <aaron.lu@intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/gpio/gpio-crystalcove.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/gpio/gpio-crystalcove.c
+++ b/drivers/gpio/gpio-crystalcove.c
@@ -250,6 +250,7 @@ static struct irq_chip crystalcove_irqch
 	.irq_set_type		= crystalcove_irq_type,
 	.irq_bus_lock		= crystalcove_bus_lock,
 	.irq_bus_sync_unlock	= crystalcove_bus_sync_unlock,
+	.flags			= IRQCHIP_SKIP_SET_WAKE,
 };
 
 static irqreturn_t crystalcove_gpio_irq_handler(int irq, void *data)


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#1187822 — [PATCH 4.0 51/58] leds / PM: fix hibernation on arm when gpio-led used with CPU led trigger

4.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Grygorii Strashko <Grygorii.Strashko@linaro.org>

commit 084609bf727981c7a2e6e69aefe0052c9d793300 upstream.

Setting a dev_pm_ops suspend/resume pair of callbacks but not a set of
hibernation callbacks means those pm functions will not be
called upon hibernation - that leads to system crash on ARM during
freezing if gpio-led is used in combination with CPU led trigger.
It may happen after freeze_noirq stage (GPIO is suspended)
and before syscore_suspend stage (CPU led trigger is suspended)
- usually when disable_nonboot_cpus() is called.

Log:
  PM: noirq freeze of devices complete after 1.425 msecs
  Disabling non-boot CPUs ...
    ^ system may crash or stuck here with message (TI AM572x)

  WARNING: CPU: 0 PID: 3100 at drivers/bus/omap_l3_noc.c:148 l3_interrupt_handler+0x22c/0x370()
  44000000.ocp:L3 Custom Error: MASTER MPU TARGET L4_PER1_P3 (Idle): Data Access in Supervisor mode during Functional access

  CPU1: shutdown
    ^ or here

Fix this by using SIMPLE_DEV_PM_OPS, which appropriately
assigns the suspend and hibernation callbacks and move
led_suspend/led_resume under CONFIG_PM_SLEEP to avoid
build warnings.

Fixes: 73e1ab41a80d (leds: Convert led class driver from legacy pm ops to dev_pm_ops)
Signed-off-by: Grygorii Strashko <Grygorii.Strashko@linaro.org>
Acked-by: Jacek Anaszewski <j.anaszewski@samsung.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/leds/led-class.c |    7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

--- a/drivers/leds/led-class.c
+++ b/drivers/leds/led-class.c
@@ -187,6 +187,7 @@ void led_classdev_resume(struct led_clas
 }
 EXPORT_SYMBOL_GPL(led_classdev_resume);
 
+#ifdef CONFIG_PM_SLEEP
 static int led_suspend(struct device *dev)
 {
 	struct led_classdev *led_cdev = dev_get_drvdata(dev);
@@ -206,11 +207,9 @@ static int led_resume(struct device *dev
 
 	return 0;
 }
+#endif
 
-static const struct dev_pm_ops leds_class_dev_pm_ops = {
-	.suspend        = led_suspend,
-	.resume         = led_resume,
-};
+static SIMPLE_DEV_PM_OPS(leds_class_dev_pm_ops, led_suspend, led_resume);
 
 /**
  * led_classdev_register - register a new object of led_classdev class.


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#1188384

On 07/19/2015 01:10 PM, Greg Kroah-Hartman wrote:
> This is the start of the stable review cycle for the 4.0.9 release.
> There are 58 patches in this series, all will be posted as a response
> to this one.  If anyone has any issues with these being applied, please
> let me know.
> 
> Responses should be made by Tue Jul 21 19:08:01 UTC 2015.
> Anything received after that time might be too late.
> 
> The whole patch series can be found in one patch at:
> 	kernel.org/pub/linux/kernel/v4.x/stable-review/patch-4.0.9-rc1.gz
> and the diffstat can be found below.
> 
> thanks,
> 
> greg k-h
> 

Compiled and booted on my test system. No dmesg regressions.

thanks,
-- Shuah


-- 
Shuah Khan
Sr. Linux Kernel Developer
Open Source Innovation Group
Samsung Research America (Silicon Valley)
shuahkh@osg.samsung.com | (970) 217-8978
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