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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.

Note: Sarah fixed this patch to apply against 3.11, since the original
commit (4fae6f0fa8 "USB: handle LPM errors
during device suspend correctly") called usb_disable_remote_wakeup,
which won't be added until 3.12.

This patch should be backported to kernels as old as 3.5, that
contain the commit 8306095fd2 "USB:
Disable USB 3.0 LPM in critical sections.".  There will be merge
conflicts, since LTM wasn't added until 3.6.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Alan Stern 2013-07-30 15:39:02 -04:00 committed by Sarah Sharp
parent ff8a43c10f
commit aa5ceae24b
1 changed files with 38 additions and 33 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

71
drivers/usb/core/hub.c
View File

@ -2918,7 +2918,6 @@ 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;
@ -2956,7 +2955,7 @@ 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;
}
}
@ -2965,14 +2964,16 @@ 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 */
@ -3000,28 +3001,31 @@ 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) {
if (!hub_is_superspeed(hub->hdev)) {
(void) usb_control_msg(udev,
usb_sndctrlpipe(udev, 0),
USB_REQ_CLEAR_FEATURE,
USB_RECIP_DEVICE,
USB_DEVICE_REMOTE_WAKEUP, 0,
NULL, 0,
USB_CTRL_SET_TIMEOUT);
} else
(void) usb_disable_function_remotewakeup(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) {
if (udev->speed < USB_SPEED_SUPER)
usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
USB_REQ_CLEAR_FEATURE,
USB_RECIP_DEVICE,
USB_DEVICE_REMOTE_WAKEUP, 0,
NULL, 0, USB_CTRL_SET_TIMEOUT);
else
usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
USB_REQ_CLEAR_FEATURE,
USB_RECIP_INTERFACE,
USB_INTRF_FUNC_SUSPEND, 0,
NULL, 0, USB_CTRL_SET_TIMEOUT);
}
err_wakeup:
/* System sleep transitions should never fail */
if (!PMSG_IS_AUTO(msg))
@ -3043,14 +3047,15 @@ 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
*/
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) {
pm_runtime_put_sync(&port_dev->dev);
port_dev->did_runtime_put = true;
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 (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);