[3.12,121/197] usb: dwc3: core: fix order of PM runtime calls

Message ID ae0262d6fd9541429f2e2ec4949fe2c28443eb1e.1413533329.git.jslaby@suse.cz
State New
Headers show

Commit Message

Jiri Slaby Oct. 17, 2014, 8:10 a.m.
From: Felipe Balbi <balbi@ti.com>

3.12-stable review patch.  If anyone has any objections, please let me know.

Patch

===============

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@ti.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
 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 474162e9d01d..3ff8bba6503b 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -584,9 +584,6 @@  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(&pdev->dev);
-	pm_runtime_disable(&pdev->dev);
-
 	dwc3_debugfs_exit(dwc);
 
 	switch (dwc->dr_mode) {
@@ -609,6 +606,9 @@  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;
 }