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[PATCH 3.16.y-ckt 039/128] xhci: fix usb2 resume timing and races.

From Luis Henriques <luis.henriques@canonical.com>
Newsgroups linux.kernel
Subject [PATCH 3.16.y-ckt 039/128] xhci: fix usb2 resume timing and races.
Date 2016-01-24 23:40 +0100
Message-ID <qUBua-2ZJ-9@gated-at.bofh.it> (permalink)
References <qUB17-2KY-3@gated-at.bofh.it>
Organization linux.* mail to news gateway

Show all headers | View raw

3.16.7-ckt23 -stable review patch.  If anyone has any objections, please let me know.

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

From: Mathias Nyman <mathias.nyman@linux.intel.com>

commit f69115fdbc1ac0718e7d19ad3caa3da2ecfe1c96 upstream.

According to USB 2 specs ports need to signal resume for at least 20ms,
in practice even longer, before moving to U0 state.
Both host and devices can initiate resume.

On device initiated resume, a port status interrupt with the port in resume
state in issued. The interrupt handler tags a resume_done[port]
timestamp with current time + USB_RESUME_TIMEOUT, and kick roothub timer.
Root hub timer requests for port status, finds the port in resume state,
checks if resume_done[port] timestamp passed, and set port to U0 state.

On host initiated resume, current code sets the port to resume state,
sleep 20ms, and finally sets the port to U0 state. This should also
be changed to work in a similar way as the device initiated resume, with
timestamp tagging, but that is not yet tested and will be a separate
fix later.

There are a few issues with this approach

1. A host initiated resume will also generate a resume event. The event
   handler will find the port in resume state, believe it's a device
   initiated resume, and act accordingly.

2. A port status request might cut the resume signalling short if a
   get_port_status request is handled during the host resume signalling.
   The port will be found in resume state. The timestamp is not set leading
   to time_after_eq(jiffies, timestamp) returning true, as timestamp = 0.
   get_port_status will proceed with moving the port to U0.

3. If an error, or anything else happens to the port during device
   initiated resume signalling it will leave all the device resume
   parameters hanging uncleared, preventing further suspend, returning
   -EBUSY, and cause the pm thread to busyloop trying to enter suspend.

Fix this by using the existing resuming_ports bitfield to indicate that
resume signalling timing is taken care of.
Check if the resume_done[port] is set before using it for timestamp
comparison, and also clear out any resume signalling related variables
if port is not in U0 or Resume state

This issue was discovered when a PM thread busylooped, trying to runtime
suspend the xhci USB 2 roothub on a Dell XPS

Reported-by: Daniel J Blueman <daniel@quora.org>
Tested-by: Daniel J Blueman <daniel@quora.org>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
---
 drivers/usb/host/xhci-hub.c  | 47 +++++++++++++++++++++++++++++++++++++++-----
 drivers/usb/host/xhci-ring.c |  3 ++-
 2 files changed, 44 insertions(+), 6 deletions(-)

diff --git a/drivers/usb/host/xhci-hub.c b/drivers/usb/host/xhci-hub.c
index 625fdd8b3537..69a70f880429 100644
--- a/drivers/usb/host/xhci-hub.c
+++ b/drivers/usb/host/xhci-hub.c
@@ -609,8 +609,30 @@ static u32 xhci_get_port_status(struct usb_hcd *hcd,
 		if ((raw_port_status & PORT_RESET) ||
 				!(raw_port_status & PORT_PE))
 			return 0xffffffff;
-		if (time_after_eq(jiffies,
-					bus_state->resume_done[wIndex])) {
+		/* did port event handler already start resume timing? */
+		if (!bus_state->resume_done[wIndex]) {
+			/* If not, maybe we are in a host initated resume? */
+			if (test_bit(wIndex, &bus_state->resuming_ports)) {
+				/* Host initated resume doesn't time the resume
+				 * signalling using resume_done[].
+				 * It manually sets RESUME state, sleeps 20ms
+				 * and sets U0 state. This should probably be
+				 * changed, but not right now.
+				 */
+			} else {
+				/* port resume was discovered now and here,
+				 * start resume timing
+				 */
+				unsigned long timeout = jiffies +
+					msecs_to_jiffies(USB_RESUME_TIMEOUT);
+
+				set_bit(wIndex, &bus_state->resuming_ports);
+				bus_state->resume_done[wIndex] = timeout;
+				mod_timer(&hcd->rh_timer, timeout);
+			}
+		/* Has resume been signalled for USB_RESUME_TIME yet? */
+		} else if (time_after_eq(jiffies,
+					 bus_state->resume_done[wIndex])) {
 			int time_left;
 
 			xhci_dbg(xhci, "Resume USB2 port %d\n",
@@ -651,13 +673,26 @@ static u32 xhci_get_port_status(struct usb_hcd *hcd,
 		} else {
 			/*
 			 * The resume has been signaling for less than
-			 * 20ms. Report the port status as SUSPEND,
-			 * let the usbcore check port status again
-			 * and clear resume signaling later.
+			 * USB_RESUME_TIME. Report the port status as SUSPEND,
+			 * let the usbcore check port status again and clear
+			 * resume signaling later.
 			 */
 			status |= USB_PORT_STAT_SUSPEND;
 		}
 	}
+	/*
+	 * Clear stale usb2 resume signalling variables in case port changed
+	 * state during resume signalling. For example on error
+	 */
+	if ((bus_state->resume_done[wIndex] ||
+	     test_bit(wIndex, &bus_state->resuming_ports)) &&
+	    (raw_port_status & PORT_PLS_MASK) != XDEV_U3 &&
+	    (raw_port_status & PORT_PLS_MASK) != XDEV_RESUME) {
+		bus_state->resume_done[wIndex] = 0;
+		clear_bit(wIndex, &bus_state->resuming_ports);
+	}
+
+
 	if ((raw_port_status & PORT_PLS_MASK) == XDEV_U0 &&
 	    (raw_port_status & PORT_POWER)) {
 		if (bus_state->suspended_ports & (1 << wIndex)) {
@@ -991,6 +1026,7 @@ int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
 				if ((temp & PORT_PE) == 0)
 					goto error;
 
+				set_bit(wIndex, &bus_state->resuming_ports);
 				xhci_set_link_state(xhci, port_array, wIndex,
 							XDEV_RESUME);
 				spin_unlock_irqrestore(&xhci->lock, flags);
@@ -998,6 +1034,7 @@ int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
 				spin_lock_irqsave(&xhci->lock, flags);
 				xhci_set_link_state(xhci, port_array, wIndex,
 							XDEV_U0);
+				clear_bit(wIndex, &bus_state->resuming_ports);
 			}
 			bus_state->port_c_suspend |= 1 << wIndex;
 
diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index 93cbefdacd31..22c9bca66569 100644
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -1620,7 +1620,8 @@ static void handle_port_status(struct xhci_hcd *xhci,
 			 */
 			bogus_port_status = true;
 			goto cleanup;
-		} else {
+		} else if (!test_bit(faked_port_index,
+				     &bus_state->resuming_ports)) {
 			xhci_dbg(xhci, "resume HS port %d\n", port_id);
 			bus_state->resume_done[faked_port_index] = jiffies +
 				msecs_to_jiffies(USB_RESUME_TIMEOUT);

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  [PATCH 3.16.y-ckt 053/128] i2c: mv64xxx: The n clockdiv factor is 0 based on sunxi SoCs Luis Henriques <luis.henriques@canonical.com> - 2016-01-24 23:30 +0100
  [PATCH 3.16.y-ckt 042/128] mm: hugetlb: fix hugepage memory leak caused by wrong reserve count Luis Henriques <luis.henriques@canonical.com> - 2016-01-24 23:40 +0100
  [PATCH 3.16.y-ckt 033/128] ALSA: hda - Fix noise problems on Thinkpad T440s Luis Henriques <luis.henriques@canonical.com> - 2016-01-24 23:40 +0100
  [PATCH 3.16.y-ckt 049/128] efi: Disable interrupts around EFI calls, not in the epilog/prolog calls Luis Henriques <luis.henriques@canonical.com> - 2016-01-24 23:40 +0100
  [PATCH 3.16.y-ckt 039/128] xhci: fix usb2 resume timing and races. Luis Henriques <luis.henriques@canonical.com> - 2016-01-24 23:40 +0100
  [PATCH 3.16.y-ckt 046/128] ocfs2: fix SGID not inherited issue Luis Henriques <luis.henriques@canonical.com> - 2016-01-24 23:40 +0100
  [PATCH 3.16.y-ckt 045/128] drivers/base/memory.c: prohibit offlining of memory blocks with missing sections Luis Henriques <luis.henriques@canonical.com> - 2016-01-24 23:40 +0100
  [PATCH 3.16.y-ckt 005/128] USB: cdc_acm: Ignore Infineon Flash Loader utility Luis Henriques <luis.henriques@canonical.com> - 2016-01-24 23:40 +0100
  [PATCH 3.16.y-ckt 010/128] AHCI: Fix softreset failed issue of Port Multiplier Luis Henriques <luis.henriques@canonical.com> - 2016-01-24 23:40 +0100
  [PATCH 3.16.y-ckt 031/128] radeon: Fix VCE ring test for Big-Endian systems Luis Henriques <luis.henriques@canonical.com> - 2016-01-24 23:40 +0100
  [PATCH 3.16.y-ckt 004/128] USB: cp210x: Remove CP2110 ID from compatibility list Luis Henriques <luis.henriques@canonical.com> - 2016-01-24 23:40 +0100
  [PATCH 3.16.y-ckt 006/128] USB: serial: Another Infineon flash loader USB ID Luis Henriques <luis.henriques@canonical.com> - 2016-01-24 23:40 +0100
  [PATCH 3.16.y-ckt 050/128] MIPS: uaccess: Take EVA into account in __copy_from_user() Luis Henriques <luis.henriques@canonical.com> - 2016-01-24 23:40 +0100
  [PATCH 3.16.y-ckt 037/128] dm btree: fix bufio buffer leaks in dm_btree_del() error path Luis Henriques <luis.henriques@canonical.com> - 2016-01-24 23:40 +0100
  [PATCH 3.16.y-ckt 051/128] MIPS: uaccess: Take EVA into account in [__]clear_user Luis Henriques <luis.henriques@canonical.com> - 2016-01-24 23:40 +0100
  [PATCH 3.16.y-ckt 007/128] ext4: Fix handling of extended tv_sec Luis Henriques <luis.henriques@canonical.com> - 2016-01-24 23:40 +0100
  [PATCH 3.16.y-ckt 036/128] ipmi: move timer init to before irq is setup Luis Henriques <luis.henriques@canonical.com> - 2016-01-24 23:40 +0100
  [PATCH 3.16.y-ckt 035/128] dm space map metadata: fix ref counting bug when bootstrapping a new space map Luis Henriques <luis.henriques@canonical.com> - 2016-01-24 23:40 +0100
  [PATCH 3.16.y-ckt 032/128] radeon: Fix VCE IB test on Big-Endian systems Luis Henriques <luis.henriques@canonical.com> - 2016-01-24 23:40 +0100
  [PATCH 3.16.y-ckt 043/128] mm, vmstat: allow WQ concurrency to discover memory reclaim doesn't make any progress Luis Henriques <luis.henriques@canonical.com> - 2016-01-24 23:40 +0100
  [PATCH 3.16.y-ckt 041/128] parisc iommu: fix panic due to trying to allocate too large region Luis Henriques <luis.henriques@canonical.com> - 2016-01-24 23:40 +0100
  [PATCH 3.16.y-ckt 048/128] usb: musb: USB_TI_CPPI41_DMA requires dmaengine support Luis Henriques <luis.henriques@canonical.com> - 2016-01-24 23:40 +0100
  [PATCH 3.16.y-ckt 047/128] sh64: fix __NR_fgetxattr Luis Henriques <luis.henriques@canonical.com> - 2016-01-24 23:40 +0100
  [PATCH 3.16.y-ckt 038/128] vgaarb: fix signal handling in vga_get() Luis Henriques <luis.henriques@canonical.com> - 2016-01-24 23:40 +0100
  [PATCH 3.16.y-ckt 044/128] mm: hugetlb: call huge_pte_alloc() only if ptep is null Luis Henriques <luis.henriques@canonical.com> - 2016-01-24 23:40 +0100
  [PATCH 3.16.y-ckt 029/128] 9p: ->evict_inode() should kick out ->i_data, not ->i_mapping Luis Henriques <luis.henriques@canonical.com> - 2016-01-24 23:40 +0100
  [PATCH 3.16.y-ckt 028/128] ALSA: hda - Fixing speaker noise on the two latest thinkpad models Luis Henriques <luis.henriques@canonical.com> - 2016-01-24 23:50 +0100
  [PATCH 3.16.y-ckt 025/128] nfs4: limit callback decoding to received bytes Luis Henriques <luis.henriques@canonical.com> - 2016-01-24 23:50 +0100
  [PATCH 3.16.y-ckt 021/128] usb: xhci: fix config fail of FS hub behind a HS hub with MTT Luis Henriques <luis.henriques@canonical.com> - 2016-01-24 23:50 +0100
  [PATCH 3.16.y-ckt 026/128] SUNRPC: Fix callback channel Luis Henriques <luis.henriques@canonical.com> - 2016-01-24 23:50 +0100
  [PATCH 3.16.y-ckt 020/128] perf: Fix PERF_EVENT_IOC_PERIOD deadlock Luis Henriques <luis.henriques@canonical.com> - 2016-01-24 23:50 +0100
  [PATCH 3.16.y-ckt 024/128] virtio: fix memory leak of virtio ida cache layers Luis Henriques <luis.henriques@canonical.com> - 2016-01-24 23:50 +0100
  [PATCH 3.16.y-ckt 129/129] Revert "[stable-only] net: add length argument to skb_copy_and_csum_datagram_iovec" Luis Henriques <luis.henriques@canonical.com> - 2016-01-25 12:00 +0100

csiph-web