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| author | Li Jun <jun.li@freescale.com> | 2015-04-12 17:51:02 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-05-13 05:14:26 -0700 |
| commit | 1fe4f5a891aaec75cebb6e763557c8c694c6260f (patch) | |
| tree | 7176ee7786677c17645e5218612202365a5661fe | |
| parent | 84b38028077d61c7058ede49ab7d115c563dc9ba (diff) | |
| download | lwn-1fe4f5a891aaec75cebb6e763557c8c694c6260f.tar.gz lwn-1fe4f5a891aaec75cebb6e763557c8c694c6260f.zip | |
usb: chipidea: otg: remove mutex unlock and lock while stop and start role
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>
| -rw-r--r-- | drivers/usb/chipidea/otg_fsm.c | 4 |
1 files changed, 0 insertions, 4 deletions
diff --git a/drivers/usb/chipidea/otg_fsm.c b/drivers/usb/chipidea/otg_fsm.c index 562e581f6765..3770330a2201 100644 --- 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_fsm *fsm, int on) { 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_fsm *fsm, int on) 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 otg_fsm *fsm, int on) { 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; } |