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authorAlan Stern <stern@rowland.harvard.edu>2013-10-18 11:18:21 -0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-10-19 14:10:16 -0700
commitb8efdafb4005a79ab2305f8af31025d49292d4cf (patch)
tree730c489ddb3c786cb7b45b9adbbeed4ba81d9653 /drivers/usb/host
parent0a56b4fa6844f74976d4bfa4956fa6d606b392ea (diff)
USB: EHCI: add check for wakeup/suspend race
hcd-pci.c in usbcore contains a check for wakeup requests racing with controller suspend. This check is going to be moved out of usbcore and into the individual controller drivers, where it can apply to all platforms, not just PCI. This patch adds the check to ehci-hcd. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/host')
-rw-r--r--drivers/usb/host/ehci-hcd.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index e66706aa9f0c..e8ba4c44223a 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -1095,6 +1095,14 @@ int ehci_suspend(struct usb_hcd *hcd, bool do_wakeup)
clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
spin_unlock_irq(&ehci->lock);
+ synchronize_irq(hcd->irq);
+
+ /* Check for race with a wakeup request */
+ if (do_wakeup && HCD_WAKEUP_PENDING(hcd)) {
+ ehci_resume(hcd, false);
+ return -EBUSY;
+ }
+
return 0;
}
EXPORT_SYMBOL_GPL(ehci_suspend);