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Commit f6cced1a authored by Lan Tianyu's avatar Lan Tianyu Committed by Greg Kroah-Hartman
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usb: expose usb port's pm qos flags to user space 



This patch is to expose usb port's pm qos flags(pm_qos_no_power_off,
pm_qos_remote_wakeup) to user space. User can set pm_qos_no_power_off
flag to prohibit the port from being powered off.

Acked-by: default avatarAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: default avatarLan Tianyu <tianyu.lan@intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent ad493e5e

drivers/usb/core/port.c

+10 −1
Original line number Diff line number Diff line
@@ -67,6 +67,7 @@ static void usb_port_device_release(struct device *dev) 
{

	struct usb_port *port_dev = to_usb_port(dev);



	dev_pm_qos_hide_flags(dev);

	usb_acpi_unregister_power_resources(dev);

	kfree(port_dev);

}
@@ -176,8 +177,16 @@ int usb_hub_create_port_device(struct usb_hub *hub, int port1) 
		goto error_register;



	pm_runtime_set_active(&port_dev->dev);



	/* It would be dangerous if user space couldn't

	 * prevent usb device from being powered off. So don't

	 * enable port runtime pm if failed to expose port's pm qos.

	 */

	if (!dev_pm_qos_expose_flags(&port_dev->dev,

			PM_QOS_FLAG_NO_POWER_OFF))

		pm_runtime_enable(&port_dev->dev);





	retval = usb_acpi_register_power_resources(&port_dev->dev);

	if (retval && retval != -ENODEV)

		dev_warn(&port_dev->dev, "the port can't register its ACPI power resource.\n");