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USB/PCI: Fix resume breakage of controllers behind cardbus bridges

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If a USB PCI controller is behind a cardbus bridge, we are trying to
restore its configuration registers too early, before the cardbus
bridge is operational.  To fix this, call pci_restore_state() from
usb_hcd_pci_resume() and remove usb_hcd_pci_resume_early() which is
no longer necessary (the configuration spaces of USB controllers that
are not behind cardbus bridges will be restored by the PCI PM core
with interrupts disabled anyway).

This patch fixes the regression from 2.6.28 tracked as
http://bugzilla.kernel.org/show_bug.cgi?id=12659

[ Side note: the proper long-term fix is probably to just force the
  unplug event at suspend time instead of doing a plug/unplug at resume
  time, but this patch is fine regardless  - Linus ]

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Reported-by: Miles Lane <miles.lane@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Rafael J. Wysocki
2009-02-13 23:41:12 +01:00
committed by Linus Torvalds
parent e78ac4b9de
commit 3494252d56
5 changed files with 2 additions and 17 deletions
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1
drivers/usb/host/ohci-pci.c
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@ -487,7 +487,6 @@ static struct pci_driver ohci_pci_driver = {
#ifdef CONFIG_PM
.suspend = usb_hcd_pci_suspend,
.resume_early = usb_hcd_pci_resume_early,
.resume = usb_hcd_pci_resume,
#endif