Commit 4fae6f0f authored by Alan Stern's avatar Alan Stern Committed by Greg Kroah-Hartman
Browse files

USB: handle LPM errors during device suspend correctly 



The hub driver's usb_port_suspend() routine doesn't handle errors
related to Link Power Management properly.  It always returns failure,
it doesn't try to clean up the wakeup setting, (in the case of system
sleep) it doesn't try to go ahead with the port suspend regardless,
and it doesn't try to apply the new power-off mechanism.

This patch fixes these problems.

Signed-off-by: default avatarAlan Stern <stern@rowland.harvard.edu>
Acked-by: default avatarSarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 28e86165

drivers/usb/core/hub.c

+26 −22
Original line number Diff line number Diff line
@@ -2948,7 +2948,6 @@ int usb_port_suspend(struct usb_device *udev, pm_message_t msg) 
{

	struct usb_hub	*hub = usb_hub_to_struct_hub(udev->parent);

	struct usb_port *port_dev = hub->ports[udev->portnum - 1];

	enum pm_qos_flags_status pm_qos_stat;

	int		port1 = udev->portnum;

	int		status;

	bool		really_suspend = true;
@@ -2966,7 +2965,7 @@ int usb_port_suspend(struct usb_device *udev, pm_message_t msg) 
					status);

			/* bail if autosuspend is requested */

			if (PMSG_IS_AUTO(msg))

				return status;

				goto err_wakeup;

		}

	}
@@ -2975,14 +2974,16 @@ int usb_port_suspend(struct usb_device *udev, pm_message_t msg) 
		usb_set_usb2_hardware_lpm(udev, 0);



	if (usb_disable_ltm(udev)) {

		dev_err(&udev->dev, "%s Failed to disable LTM before suspend\n.",

				__func__);

		return -ENOMEM;

		dev_err(&udev->dev, "Failed to disable LTM before suspend\n.");

		status = -ENOMEM;

		if (PMSG_IS_AUTO(msg))

			goto err_ltm;

	}

	if (usb_unlocked_disable_lpm(udev)) {

		dev_err(&udev->dev, "%s Failed to disable LPM before suspend\n.",

				__func__);

		return -ENOMEM;

		dev_err(&udev->dev, "Failed to disable LPM before suspend\n.");

		status = -ENOMEM;

		if (PMSG_IS_AUTO(msg))

			goto err_lpm3;

	}



	/* see 7.1.7.6 */
@@ -3010,17 +3011,19 @@ int usb_port_suspend(struct usb_device *udev, pm_message_t msg) 
	if (status) {

		dev_dbg(hub->intfdev, "can't suspend port %d, status %d\n",

				port1, status);

		/* paranoia:  "should not happen" */

		if (udev->do_remote_wakeup)

			(void) usb_disable_remote_wakeup(udev);



		/* Try to enable USB3 LPM and LTM again */

		usb_unlocked_enable_lpm(udev);

 err_lpm3:

		usb_enable_ltm(udev);

 err_ltm:

		/* Try to enable USB2 hardware LPM again */

		if (udev->usb2_hw_lpm_capable == 1)

			usb_set_usb2_hardware_lpm(udev, 1);



		/* Try to enable USB3 LTM and LPM again */

		usb_enable_ltm(udev);

		usb_unlocked_enable_lpm(udev);

		if (udev->do_remote_wakeup)

			(void) usb_disable_remote_wakeup(udev);

 err_wakeup:



		/* System sleep transitions should never fail */

		if (!PMSG_IS_AUTO(msg))
@@ -3042,15 +3045,16 @@ int usb_port_suspend(struct usb_device *udev, pm_message_t msg) 
	 * Check whether current status meets the requirement of

	 * usb port power off mechanism

	 */

	if (status == 0 && !udev->do_remote_wakeup && udev->persist_enabled) {

		enum pm_qos_flags_status pm_qos_stat;



		pm_qos_stat = dev_pm_qos_flags(&port_dev->dev,

				PM_QOS_FLAG_NO_POWER_OFF);

	if (!udev->do_remote_wakeup

			&& pm_qos_stat != PM_QOS_FLAGS_ALL

			&& udev->persist_enabled

			&& !status) {

		if (pm_qos_stat != PM_QOS_FLAGS_ALL) {

			pm_runtime_put_sync(&port_dev->dev);

			port_dev->did_runtime_put = true;

		}

	}



	usb_mark_last_busy(hub->hdev);

	return status;

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