Commit 353a4098 authored Sep 19, 2006 by Alan Stern Committed by Greg Kroah-Hartman Sep 27, 2006

USB: force root hub resume after power loss



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>

parent 71795c1d

drivers/usb/core/hub.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -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) {

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