[ 3.8.y.z extended stable ] Patch "USB: handle LPM errors during device suspend correctly" has been added to staging queue

Kamal Mostafa kamal at canonical.com
Thu Sep 19 00:03:23 UTC 2013


This is a note to let you know that I have just added a patch titled

    USB: handle LPM errors during device suspend correctly

to the linux-3.8.y-queue branch of the 3.8.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.8.y-queue

This patch is scheduled to be released in version 3.8.13.10.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.8.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

------

>From 5850be320509a806d723887faa3fc28b470fadef Mon Sep 17 00:00:00 2001
From: Alan Stern <stern at rowland.harvard.edu>
Date: Tue, 30 Jul 2013 15:39:02 -0400
Subject: USB: handle LPM errors during device suspend correctly

commit aa5ceae24bf8dff1d6fe87c6c4b08e69c6d33550 upstream.

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 (4fae6f0fa86f92e6bc7429371b1e177ad0aaac66 "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 8306095fd2c1100e8244c09bf560f97aca5a311d "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 at rowland.harvard.edu>
Signed-off-by: Sarah Sharp <sarah.a.sharp at linux.intel.com>
[ kamal: backport to 3.8: dropped the pm_qos change in usb_port_suspend ]
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
 drivers/usb/core/hub.c | 53 +++++++++++++++++++++++++++-----------------------
 1 file changed, 29 insertions(+), 24 deletions(-)

diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index d96ca07..0763d84 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -2951,7 +2951,7 @@ 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;
 		}
 	}

@@ -2960,14 +2960,16 @@ 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 */
@@ -2981,28 +2983,31 @@ 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))
--
1.8.1.2





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