diff options
| author | Li Jun <jun.li@freescale.com> | 2015-04-12 09:51:02 (GMT) |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-04-28 10:51:30 (GMT) |
| commit | a5a356cee89f86ff86cc3ce24136ca1f802c1bf1 (patch) | |
| tree | b76a87e85f668e4c95c6ec4966994266c0bebcc0 /drivers/usb/chipidea | |
| parent | 8e779c6c4a398763c21371fe40f649206041dc1e (diff) | |
| download | linux-a5a356cee89f86ff86cc3ce24136ca1f802c1bf1.tar.xz | |
usb: chipidea: otg: remove mutex unlock and lock while stop and start role
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")
Cc: <stable@vger.kernel.org> # v3.16+
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>
Diffstat (limited to 'drivers/usb/chipidea')
| -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 083acf4..19d655a 100644 --- a/drivers/usb/chipidea/otg_fsm.c +++ b/drivers/usb/chipidea/otg_fsm.c @@ -520,7 +520,6 @@ 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); @@ -529,7 +528,6 @@ 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; } @@ -537,12 +535,10 @@ 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; } |