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 <[email protected]> --- drivers/usb/core/port.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/usb/core/port.c b/drivers/usb/core/port.c index 968dd41..0248b88 100644 --- a/drivers/usb/core/port.c +++ b/drivers/usb/core/port.c @@ -186,6 +186,7 @@ int usb_hub_create_port_device(struct usb_hub *hub, int port1) PM_QOS_FLAG_NO_POWER_OFF)) pm_runtime_enable(&port_dev->dev); + device_enable_async_suspend(&port_dev->dev); retval = usb_acpi_register_power_resources(&port_dev->dev); if (retval && retval != -ENODEV) -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
