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Groups > linux.kernel > #1354664

[PATCH 3.13.y-ckt 037/138] radix-tree: fix race in gang lookup

From Kamal Mostafa <kamal@canonical.com>
Newsgroups linux.kernel
Subject [PATCH 3.13.y-ckt 037/138] radix-tree: fix race in gang lookup
Date 2016-03-10 00:50 +0100
Message-ID <raW1B-716-31@gated-at.bofh.it> (permalink)
References <raVyx-6Nd-3@gated-at.bofh.it>
Organization linux.* mail to news gateway

Show all headers | View raw

3.13.11-ckt36 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Matthew Wilcox <willy@linux.intel.com>

commit 46437f9a554fbe3e110580ca08ab703b59f2f95a upstream.

If the indirect_ptr bit is set on a slot, that indicates we need to redo
the lookup.  Introduce a new function radix_tree_iter_retry() which
forces the loop to retry the lookup by setting 'slot' to NULL and
turning the iterator back to point at the problematic entry.

This is a pretty rare problem to hit at the moment; the lookup has to
race with a grow of the radix tree from a height of 0.  The consequences
of hitting this race are that gang lookup could return a pointer to a
radix_tree_node instead of a pointer to whatever the user had inserted
in the tree.

Fixes: cebbd29e1c2f ("radix-tree: rewrite gang lookup using iterator")
Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Ohad Ben-Cohen <ohad@wizery.com>
Cc: Konstantin Khlebnikov <khlebnikov@openvz.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
 include/linux/radix-tree.h | 16 ++++++++++++++++
 lib/radix-tree.c           | 12 ++++++++++--
 2 files changed, 26 insertions(+), 2 deletions(-)

diff --git a/include/linux/radix-tree.h b/include/linux/radix-tree.h
index 4039407..cbeae48 100644
--- a/include/linux/radix-tree.h
+++ b/include/linux/radix-tree.h
@@ -323,6 +323,22 @@ void **radix_tree_next_chunk(struct radix_tree_root *root,
 			     struct radix_tree_iter *iter, unsigned flags);
 
 /**
+ * radix_tree_iter_retry - retry this chunk of the iteration
+ * @iter:	iterator state
+ *
+ * If we iterate over a tree protected only by the RCU lock, a race
+ * against deletion or creation may result in seeing a slot for which
+ * radix_tree_deref_retry() returns true.  If so, call this function
+ * and continue the iteration.
+ */
+static inline __must_check
+void **radix_tree_iter_retry(struct radix_tree_iter *iter)
+{
+	iter->next_index = iter->index;
+	return NULL;
+}
+
+/**
  * radix_tree_chunk_size - get current chunk size
  *
  * @iter:	pointer to radix tree iterator
diff --git a/lib/radix-tree.c b/lib/radix-tree.c
index 7811ed3..1153de4 100644
--- a/lib/radix-tree.c
+++ b/lib/radix-tree.c
@@ -1052,9 +1052,13 @@ radix_tree_gang_lookup(struct radix_tree_root *root, void **results,
 		return 0;
 
 	radix_tree_for_each_slot(slot, root, &iter, first_index) {
-		results[ret] = indirect_to_ptr(rcu_dereference_raw(*slot));
+		results[ret] = rcu_dereference_raw(*slot);
 		if (!results[ret])
 			continue;
+		if (radix_tree_is_indirect_ptr(results[ret])) {
+			slot = radix_tree_iter_retry(&iter);
+			continue;
+		}
 		if (++ret == max_items)
 			break;
 	}
@@ -1131,9 +1135,13 @@ radix_tree_gang_lookup_tag(struct radix_tree_root *root, void **results,
 		return 0;
 
 	radix_tree_for_each_tagged(slot, root, &iter, first_index, tag) {
-		results[ret] = indirect_to_ptr(rcu_dereference_raw(*slot));
+		results[ret] = rcu_dereference_raw(*slot);
 		if (!results[ret])
 			continue;
+		if (radix_tree_is_indirect_ptr(results[ret])) {
+			slot = radix_tree_iter_retry(&iter);
+			continue;
+		}
 		if (++ret == max_items)
 			break;
 	}
-- 
2.7.0

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[3.13.y-ckt stable] Linux 3.13.11-ckt36 stable review Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:20 +0100
  [PATCH 3.13.y-ckt 059/138] mm: replace vma_lock_anon_vma with anon_vma_lock_read/write Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:20 +0100
  [PATCH 3.13.y-ckt 009/138] iio: dac: mcp4725: set iio name property in sysfs Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:20 +0100
  [PATCH 3.13.y-ckt 017/138] drm/i915/dp: fall back to 18 bpp when sink capability is unknown Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:20 +0100
  [PATCH 3.13.y-ckt 070/138] ARM: 8517/1: ICST: avoid arithmetic overflow in icst_hz() Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:20 +0100
  [PATCH 3.13.y-ckt 109/138] KVM: async_pf: do not warn on page allocation failures Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:30 +0100
  [PATCH 3.13.y-ckt 126/138] sctp: translate network order to host order when users get a hmacid Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:30 +0100
  [PATCH 3.13.y-ckt 113/138] hpfs: don't truncate the file when delete fails Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:30 +0100
  [PATCH 3.13.y-ckt 119/138] pptp: fix illegal memory access caused by multiple bind()s Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:30 +0100
  [PATCH 3.13.y-ckt 117/138] tcp: fix NULL deref in tcp_v4_send_ack() Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:30 +0100
  [PATCH 3.13.y-ckt 090/138] ALSA: seq: Drop superfluous error/debug messages after malloc failures Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:30 +0100
  [PATCH 3.13.y-ckt 131/138] rtnl: RTM_GETNETCONF: fix wrong return value Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:30 +0100
  [PATCH 3.13.y-ckt 123/138] ipv6: fix a lockdep splat Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:30 +0100
  [PATCH 3.13.y-ckt 137/138] af_unix: Don't set err in unix_stream_read_generic unless there was an error Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:30 +0100
  [PATCH 3.13.y-ckt 134/138] bonding: Fix ARP monitor validation Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:30 +0100
  [PATCH 3.13.y-ckt 130/138] pppoe: fix reference counting in PPPoE proxy Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:30 +0100
  [PATCH 3.13.y-ckt 138/138] pipe: limit the per-user amount of pages allocated in pipes Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:30 +0100
  [PATCH 3.13.y-ckt 110/138] tracing: Fix showing function event in available_events Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:30 +0100
  [PATCH 3.13.y-ckt 114/138] do_last(): don't let a bogus return value from ->open() et.al. to confuse us Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:30 +0100
  [PATCH 3.13.y-ckt 125/138] net:Add sysctl_max_skb_frags Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:30 +0100
  [PATCH 3.13.y-ckt 111/138] libceph: don't bail early from try_read() when skipping a message Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:30 +0100
  [PATCH 3.13.y-ckt 120/138] sctp: allow setting SCTP_SACK_IMMEDIATELY by the application Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:30 +0100
  [PATCH 3.13.y-ckt 101/138] USB: option: add "4G LTE usb-modem U901" Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:30 +0100
  [PATCH 3.13.y-ckt 115/138] af_iucv: Validate socket address length in iucv_sock_bind() Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:30 +0100
  [PATCH 3.13.y-ckt 122/138] net/ipv6: add sysctl option accept_ra_min_hop_limit Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:30 +0100
  [PATCH 3.13.y-ckt 132/138] unix_diag: fix incorrect sign extension in unix_lookup_by_ino Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:30 +0100
  [PATCH 3.13.y-ckt 127/138] af_unix: Guard against other == sk in unix_dgram_sendmsg Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:30 +0100
  [PATCH 3.13.y-ckt 129/138] net/mlx4_en: Count HW buffer overrun only once Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:30 +0100
  [PATCH 3.13.y-ckt 112/138] KVM: x86: MMU: fix ubsan index-out-of-range warning Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:30 +0100
  [PATCH 3.13.y-ckt 097/138] drm/qxl: use kmalloc_array to alloc reloc_info in qxl_process_single_command Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:30 +0100
  [PATCH 3.13.y-ckt 077/138] workqueue: handle NUMA_NO_NODE for unbound pool_workqueue lookup Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:30 +0100
  [PATCH 3.13.y-ckt 116/138] net: dp83640: Fix tx timestamp overflow handling. Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:30 +0100
  [PATCH 3.13.y-ckt 128/138] qmi_wwan: add "4G LTE usb-modem U901" Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:30 +0100
  [PATCH 3.13.y-ckt 136/138] net/mlx4_en: Choose time-stamping shift value according to HW frequency Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:30 +0100
  [PATCH 3.13.y-ckt 118/138] af_unix: fix struct pid memory leak Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:30 +0100
  [PATCH 3.13.y-ckt 135/138] ipv4: fix memory leaks in ip_cmsg_send() callers Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:30 +0100
  [PATCH 3.13.y-ckt 133/138] sctp: Fix port hash table size computation Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:30 +0100
  [PATCH 3.13.y-ckt 124/138] unix: correctly track in-flight fds in sending process user_struct Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:30 +0100
  [PATCH 3.13.y-ckt 121/138] ipv6/udp: use sticky pktinfo egress ifindex on connect() Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:30 +0100
  [PATCH 3.13.y-ckt 103/138] ext4: fix bh->b_state corruption Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:40 +0100
  [PATCH 3.13.y-ckt 082/138] ARM: 8519/1: ICST: try other dividends than 1 Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:40 +0100
  [PATCH 3.13.y-ckt 074/138] phy: twl4030-usb: Relase usb phy on unload Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:40 +0100
  [PATCH 3.13.y-ckt 099/138] USB: option: add support for SIM7100E Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:40 +0100
  [PATCH 3.13.y-ckt 063/138] pty: fix possible use after free of tty->driver_data Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:40 +0100
  [PATCH 3.13.y-ckt 094/138] tracing: Fix freak link error caused by branch tracer Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:40 +0100
  [PATCH 3.13.y-ckt 108/138] sunrpc/cache: fix off-by-one in qword_get() Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:40 +0100
  [PATCH 3.13.y-ckt 089/138] xen/pcifront: Fix mysterious crashes when NUMA locality information was extracted. Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:40 +0100
  [PATCH 3.13.y-ckt 085/138] ext4: don't read blocks from disk after extents being swapped Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:40 +0100
  [PATCH 3.13.y-ckt 067/138] ALSA: dummy: Implement timer backend switching more safely Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:40 +0100
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  [PATCH 3.13.y-ckt 106/138] drivers: android: correct the size of struct binder_uintptr_t for BC_DEAD_BINDER_DONE Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:40 +0100
  [PATCH 3.13.y-ckt 096/138] drm/radeon: use post-decrement in error handling Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:40 +0100
  [PATCH 3.13.y-ckt 086/138] bio: return EINTR if copying to user space got interrupted Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:40 +0100
  [PATCH 3.13.y-ckt 093/138] tracepoints: Do not trace when cpu is offline Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:40 +0100
  [PATCH 3.13.y-ckt 072/138] ALSA: timer: Fix race between stop and interrupt Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:40 +0100
  [PATCH 3.13.y-ckt 088/138] xen/pciback: Save the number of MSI-X entries to be copied later. Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:40 +0100
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  [PATCH 3.13.y-ckt 084/138] ext4: fix potential integer overflow Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:40 +0100
  [PATCH 3.13.y-ckt 092/138] dmaengine: dw: disable BLOCK IRQs for non-cyclic xfer Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:40 +0100
  [PATCH 3.13.y-ckt 095/138] ALSA: seq: Fix double port list deletion Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:40 +0100
  [PATCH 3.13.y-ckt 104/138] ext4: fix crashes in dioread_nolock mode Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:40 +0100
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  [PATCH 3.13.y-ckt 107/138] can: ems_usb: Fix possible tx overflow Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:40 +0100
  [PATCH 3.13.y-ckt 083/138] btrfs: properly set the termination value of ctx->pos in readdir Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:40 +0100
  [PATCH 3.13.y-ckt 105/138] kernel/resource.c: fix muxed resource handling in __request_region() Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:40 +0100
  [PATCH 3.13.y-ckt 079/138] cifs: fix erroneous return value Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:40 +0100
  [PATCH 3.13.y-ckt 087/138] xen/pciback: Check PF instead of VF for PCI_COMMAND_MEMORY Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:40 +0100
  [PATCH 3.13.y-ckt 066/138] klist: fix starting point removed bug in klist iterators Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:40 +0100
  [PATCH 3.13.y-ckt 102/138] hwmon: (ads1015) Handle negative conversion values correctly Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:40 +0100
  [PATCH 3.13.y-ckt 098/138] NFSv4: Fix a dentry leak on alias use Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:40 +0100
  [PATCH 3.13.y-ckt 053/138] SCSI: Add Marvell Console to VPD blacklist Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:50 +0100
  [PATCH 3.13.y-ckt 021/138] intel_scu_ipcutil: underflow in scu_reg_access() Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:50 +0100
  [PATCH 3.13.y-ckt 041/138] target: Fix Task Aborted Status (TAS) handling Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:50 +0100
  [PATCH 3.13.y-ckt 020/138] iio: inkern: fix a NULL dereference on error Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:50 +0100
  [PATCH 3.13.y-ckt 056/138] dump_stack: avoid potential deadlocks Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:50 +0100
  [PATCH 3.13.y-ckt 027/138] libata: fix sff host state machine locking while polling Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:50 +0100
  [PATCH 3.13.y-ckt 060/138] radix-tree: fix oops after radix_tree_iter_retry Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:50 +0100
  [PATCH 3.13.y-ckt 049/138] ALSA: timer: Fix leftover link at closing Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:50 +0100
  [PATCH 3.13.y-ckt 057/138] mm, vmstat: fix wrong WQ sleep when memory reclaim doesn't make any progress Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:50 +0100
  [PATCH 3.13.y-ckt 046/138] target: Fix remote-port TMR ABORT + se_cmd fabric stop Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:50 +0100
  [PATCH 3.13.y-ckt 048/138] [media] tda1004x: only update the frontend properties if locked Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:50 +0100
  [PATCH 3.13.y-ckt 051/138] Btrfs: fix hang on extent buffer lock caused by the inode_paths ioctl Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:50 +0100
  [PATCH 3.13.y-ckt 023/138] ALSA: rawmidi: Remove kernel WARNING for NULL user-space buffer check Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:50 +0100
  [PATCH 3.13.y-ckt 037/138] radix-tree: fix race in gang lookup Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:50 +0100
  [PATCH 3.13.y-ckt 035/138] ALSA: seq: Fix lockdep warnings due to double mutex locks Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:50 +0100
  [PATCH 3.13.y-ckt 036/138] drivers/scsi/sg.c: mark VMA as VM_IO to prevent migration Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:50 +0100
  [PATCH 3.13.y-ckt 030/138] module: wrapper for symbol name. Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:50 +0100
  [PATCH 3.13.y-ckt 042/138] target: Add TFO->abort_task for aborted task resources release Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:50 +0100
  [PATCH 3.13.y-ckt 040/138] xhci: Fix list corruption in urb dequeue at host removal Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:50 +0100
  [PATCH 3.13.y-ckt 047/138] target: Fix race with SCF_SEND_DELAYED_TAS handling Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:50 +0100
  [PATCH 3.13.y-ckt 045/138] target: Fix TAS handling for multi-session se_node_acls Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:50 +0100
  [PATCH 3.13.y-ckt 038/138] Revert "xhci: don't finish a TD if we get a short-transfer event mid TD" Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:50 +0100
  [PATCH 3.13.y-ckt 008/138] x86/entry/compat: Add missing CLAC to entry_INT80_32 Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:50 +0100
  [PATCH 3.13.y-ckt 024/138] ALSA: pcm: Fix potential deadlock in OSS emulation Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:50 +0100
  [PATCH 3.13.y-ckt 054/138] drm: Add drm_fixp_from_fraction and drm_fixp2int_ceil Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:50 +0100
  [PATCH 3.13.y-ckt 022/138] ALSA: seq: Fix race at closing in virmidi driver Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:50 +0100
  [PATCH 3.13.y-ckt 052/138] scsi_dh_rdac: always retry MODE SELECT on command lock violation Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:50 +0100
  [PATCH 3.13.y-ckt 031/138] ALSA: hda - Add fixup for Mac Mini 7,1 model Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:50 +0100
  [PATCH 3.13.y-ckt 050/138] [media] saa7134-alsa: Only frees registered sound cards Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:50 +0100
  [PATCH 3.13.y-ckt 061/138] crypto: user - lock crypto_alg_list on alg dump Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:50 +0100
  [PATCH 3.13.y-ckt 012/138] libata: disable forced PORTS_IMPL for >= AHCI 1.3 Kamal Mostafa <kamal@canonical.com> - 2016-03-10 01:00 +0100
  [PATCH 3.13.y-ckt 019/138] crypto: algif_hash - wait for crypto_ahash_init() to complete Kamal Mostafa <kamal@canonical.com> - 2016-03-10 01:00 +0100
  [PATCH 3.13.y-ckt 004/138] EVM: Use crypto_memneq() for digest comparisons Kamal Mostafa <kamal@canonical.com> - 2016-03-10 01:00 +0100
  [PATCH 3.13.y-ckt 003/138] iw_cxgb3: Fix incorrectly returning error on success Kamal Mostafa <kamal@canonical.com> - 2016-03-10 01:00 +0100
  [PATCH 3.13.y-ckt 005/138] ALSA: usb-audio: avoid freeing umidi object twice Kamal Mostafa <kamal@canonical.com> - 2016-03-10 01:00 +0100
  [PATCH 3.13.y-ckt 014/138] mac80211: Requeue work after scan complete for all VIF types. Kamal Mostafa <kamal@canonical.com> - 2016-03-10 01:00 +0100
  [PATCH 3.13.y-ckt 013/138] mac80211: start_next_roc only if scan was actually running Kamal Mostafa <kamal@canonical.com> - 2016-03-10 01:00 +0100
  [PATCH 3.13.y-ckt 007/138] bcache: Fix a lockdep splat in an error path Kamal Mostafa <kamal@canonical.com> - 2016-03-10 01:00 +0100
  [PATCH 3.13.y-ckt 018/138] target: Fix WRITE_SAME/DISCARD conversion to linux 512b sectors Kamal Mostafa <kamal@canonical.com> - 2016-03-10 01:00 +0100
  [PATCH 3.13.y-ckt 010/138] iommu/vt-d: Fix 64-bit accesses to 32-bit DMAR_GSTS_REG Kamal Mostafa <kamal@canonical.com> - 2016-03-10 01:00 +0100

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