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PM: Allow USB devices to suspend/resume asynchronously

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Set power.async_suspend for USB devices, endpoints and interfaces,
allowing them to be suspended and resumed asynchronously during
system sleep transitions.

The power.async_suspend flag is also set for devices that don't have
suspend or resume callbacks, because otherwise they would make the
main suspend/resume thread wait for their "asynchronous" children
(during suspend) or parents (during resume), effectively negating the
possible gains from executing these devices' suspend and resume
callbacks asynchronously.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
This commit is contained in:
Rafael J. Wysocki
2010-02-08 19:18:16 +01:00
parent 6d19c009cc
commit 927bc9165d
3 changed files with 3 additions and 0 deletions
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drivers/usb/core/hub.c
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@@ -1817,6 +1817,7 @@ int usb_new_device(struct usb_device *udev)
/* Tell the world! */
announce_device(udev);
device_enable_async_suspend(&udev->dev);
/* Register the device. The device driver is responsible
* for configuring the device and invoking the add-device
* notifier chain (used by usbfs and possibly others).