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Commit 192fef18 authored by Lan Tianyu's avatar Lan Tianyu Committed by Greg Kroah-Hartman
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usb: enable usb port device's async suspend. 



This patch is to set power.async_suspend for usb port in order
to allow it 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: default avatarLan Tianyu <tianyu.lan@intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent f6cced1a

drivers/usb/core/port.c

+1 −0
Original line number Original line Diff line number Diff line
@@ -186,6 +186,7 @@ int usb_hub_create_port_device(struct usb_hub *hub, int port1) 
			PM_QOS_FLAG_NO_POWER_OFF))

			PM_QOS_FLAG_NO_POWER_OFF))

		pm_runtime_enable(&port_dev->dev);

		pm_runtime_enable(&port_dev->dev);





	device_enable_async_suspend(&port_dev->dev);





	retval = usb_acpi_register_power_resources(&port_dev->dev);

	retval = usb_acpi_register_power_resources(&port_dev->dev);

	if (retval && retval != -ENODEV)

	if (retval && retval != -ENODEV)