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authorAlan Stern <stern@rowland.harvard.edu>2011-02-02 13:59:33 -0500
committerGreg Kroah-Hartman <gregkh@suse.de>2011-02-03 16:46:48 -0800
commitbf3d7d40e42a85ca73a34e1385ff34f092a384eb (patch)
tree3e23ffdcf11823bc13e5e525ce36639e170cab94 /drivers/usb/core/hcd.c
parentd199c96d41d80a567493e12b8e96ea056a1350c1 (diff)
USB: fix race between root-hub resume and wakeup requests
The USB core keeps track of pending resume requests for root hubs, in order to resolve races between wakeup requests and suspends. However the code that does this is subject to another race (between wakeup requests and resumes) because the WAKEUP_PENDING flag is cleared before the resume occurs, leaving a window in which another wakeup request might arrive. This patch (as1447) fixes the problem by clearing the WAKEUP_PENDING flag after the resume instead of before it. This fixes Bugzilla #24952. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Tested-by: Paul Bender <pebender@san.rr.com> Tested-by: warpme <warpme@o2.pl> Cc: stable <stable@kernel.org> [.36+] Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/core/hcd.c')
-rw-r--r--drivers/usb/core/hcd.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index 6a95017fa62..e935f71d7a3 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -1955,7 +1955,6 @@ int hcd_bus_resume(struct usb_device *rhdev, pm_message_t msg)
dev_dbg(&rhdev->dev, "usb %s%s\n",
(msg.event & PM_EVENT_AUTO ? "auto-" : ""), "resume");
- clear_bit(HCD_FLAG_WAKEUP_PENDING, &hcd->flags);
if (!hcd->driver->bus_resume)
return -ENOENT;
if (hcd->state == HC_STATE_RUNNING)
@@ -1963,6 +1962,7 @@ int hcd_bus_resume(struct usb_device *rhdev, pm_message_t msg)
hcd->state = HC_STATE_RESUMING;
status = hcd->driver->bus_resume(hcd);
+ clear_bit(HCD_FLAG_WAKEUP_PENDING, &hcd->flags);
if (status == 0) {
/* TRSMRCY = 10 msec */
msleep(10);