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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: Lan Tianyu <tianyu.lan@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -186,6 +186,7 @@ int usb_hub_create_port_device(struct usb_hub *hub, int port1)
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PM_QOS_FLAG_NO_POWER_OFF))
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pm_runtime_enable(&port_dev->dev);
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device_enable_async_suspend(&port_dev->dev);
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retval = usb_acpi_register_power_resources(&port_dev->dev);
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if (retval && retval != -ENODEV)
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