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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>
This commit is contained in:
Alan Stern 2013-10-18 11:18:21 -04:00 committed by Greg Kroah-Hartman
parent 0a56b4fa68
commit b8efdafb40
1 changed files with 8 additions and 0 deletions
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8
drivers/usb/host/ehci-hcd.c
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@ -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);