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USB: force root hub resume after power loss

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This patch(as785) forces the PM core to resume a root hub after a
power loss during system sleep.  If the root hub had been suspended
before the system sleep then normally the PM core would not resume it
afterward.  Without this resume, various sorts of wakeup events (like
port change events) can get lost.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Stern 2006-09-19 10:07:58 -04:00 committed by Greg Kroah-Hartman
parent 71795c1df3
commit 353a4098c6
1 changed files with 6 additions and 0 deletions
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6
drivers/usb/core/hub.c
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@ -1053,6 +1053,12 @@ void usb_root_hub_lost_power(struct usb_device *rhdev)
unsigned long flags;
dev_warn(&rhdev->dev, "root hub lost power or was reset\n");
/* Make sure no potential wakeup events get lost,
* by forcing the root hub to be resumed.
*/
rhdev->dev.power.prev_state.event = PM_EVENT_ON;
spin_lock_irqsave(&device_state_lock, flags);
hub = hdev_to_hub(rhdev);
for (port1 = 1; port1 <= rhdev->maxchild; ++port1) {