Patch "usb: chipidea: otg: remove mutex unlock and lock while stop and start role" has been added to the 4.0-stable tree

Patch "usb: chipidea: otg: remove mutex unlock and lock while stop and start role" has been added to the 4.0-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    usb: chipidea: otg: remove mutex unlock and lock while stop and start role

to the 4.0-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     usb-chipidea-otg-remove-mutex-unlock-and-lock-while-stop-and-start-role.patch
and it can be found in the queue-4.0 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From a5a356cee89f86ff86cc3ce24136ca1f802c1bf1 Mon Sep 17 00:00:00 2001
From: Li Jun <jun.li@freescale.com>
Date: Sun, 12 Apr 2015 17:51:02 +0800
Subject: usb: chipidea: otg: remove mutex unlock and lock while stop and start role

From: Li Jun <jun.li@freescale.com>

commit a5a356cee89f86ff86cc3ce24136ca1f802c1bf1 upstream.

Wrongly release mutex lock during otg_statemachine may result in re-enter
otg_statemachine, which is not allowed, we should do next state transtition
after previous one completed.

Fixes: 826cfe751f3e ("usb: chipidea: add OTG fsm operation functions implementation")
Signed-off-by: Li Jun <jun.li@freescale.com>
Signed-off-by: Peter Chen <peter.chen@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/usb/chipidea/otg_fsm.c |    4 ----
 1 file changed, 4 deletions(-)

--- a/drivers/usb/chipidea/otg_fsm.c
+++ b/drivers/usb/chipidea/otg_fsm.c
@@ -537,7 +537,6 @@ static int ci_otg_start_host(struct otg_
 {
 	struct ci_hdrc	*ci = container_of(fsm, struct ci_hdrc, fsm);
 
-	mutex_unlock(&fsm->lock);
 	if (on) {
 		ci_role_stop(ci);
 		ci_role_start(ci, CI_ROLE_HOST);
@@ -546,7 +545,6 @@ static int ci_otg_start_host(struct otg_
 		hw_device_reset(ci);
 		ci_role_start(ci, CI_ROLE_GADGET);
 	}
-	mutex_lock(&fsm->lock);
 	return 0;
 }
 
@@ -554,12 +552,10 @@ static int ci_otg_start_gadget(struct ot
 {
 	struct ci_hdrc	*ci = container_of(fsm, struct ci_hdrc, fsm);
 
-	mutex_unlock(&fsm->lock);
 	if (on)
 		usb_gadget_vbus_connect(&ci->gadget);
 	else
 		usb_gadget_vbus_disconnect(&ci->gadget);
-	mutex_lock(&fsm->lock);
 
 	return 0;
 }


Patches currently in stable-queue which might be from jun.li@freescale.com are

queue-4.0/usb-chipidea-otg-remove-mutex-unlock-and-lock-while-stop-and-start-role.patch