[3.13.y.z extended stable] Patch "usb: dwc3: core: fix order of PM runtime calls" has been added to staging queue

[Kamal Mostafa]

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

    usb: dwc3: core: fix order of PM runtime calls

to the linux-3.13.y-queue branch of the 3.13.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-3.13.y-queue

This patch is scheduled to be released in version 3.13.11.9.

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

For more information about the 3.13.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

------

>From f8e3c38249612b74e8daa5faaebd3210a5c6d6b8 Mon Sep 17 00:00:00 2001
From: Felipe Balbi <balbi at ti.com>
Date: Tue, 2 Sep 2014 14:57:20 -0500
Subject: usb: dwc3: core: fix order of PM runtime calls

commit fed33afce0eda44a46ae24d93aec1b5198c0bac4 upstream.

Currently, we disable pm_runtime before all register
accesses are done, this is dangerous and might lead
to abort exceptions due to the driver trying to access
a register which is clocked by a clock which was long
gated.

Fix that by moving pm_runtime_put_sync() and pm_runtime_disable()
as the last thing we do before returning from our ->remove()
method.

Fixes: 72246da (usb: Introduce DesignWare USB3 DRD Driver)
Signed-off-by: Felipe Balbi <balbi at ti.com>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
 drivers/usb/dwc3/core.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index a49217a..8c9c4cf 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -586,9 +586,6 @@ static int dwc3_remove(struct platform_device *pdev)
 	usb_phy_set_suspend(dwc->usb2_phy, 1);
 	usb_phy_set_suspend(dwc->usb3_phy, 1);

-	pm_runtime_put_sync(&pdev->dev);
-	pm_runtime_disable(&pdev->dev);
-
 	dwc3_debugfs_exit(dwc);

 	switch (dwc->dr_mode) {
@@ -611,6 +608,9 @@ static int dwc3_remove(struct platform_device *pdev)
 	dwc3_free_event_buffers(dwc);
 	dwc3_core_exit(dwc);

+	pm_runtime_put_sync(&pdev->dev);
+	pm_runtime_disable(&pdev->dev);
+
 	return 0;
 }

--
1.9.1