diff options
| author | Sandor Yu <R01008@freescale.com> | 2015-05-29 17:07:04 +0800 |
|---|---|---|
| committer | Leonard Crestez <leonard.crestez@nxp.com> | 2018-08-24 12:20:42 +0300 |
| commit | 6559a9ebcbaea2161a06b2bd36388b640eed200c (patch) | |
| tree | eb5adb4d703a53ba57bd516de0a10005b5a8d74e /drivers/media/v4l2-core/v4l2-async.c | |
| parent | d716a0d8dbaa5c84530cdfd8ede7dd17ba4cbdcb (diff) | |
MLK-11508-2 v4l2: Add v4l2_async_notifier_unregister recursively call
If anyone calls v4l2_async_notifier_unregister() recursively from
device_release_driver(), code will deadlock at list_lock, so unlock
list_lock when device_release_driver() called.
Signed-off-by: Sandor Yu <R01008@freescale.com>
(cherry picked from commit f0b54df4d1b58f8f6608e1b08a80a5acb8cc12ea)
Diffstat (limited to 'drivers/media/v4l2-core/v4l2-async.c')
| -rw-r--r-- | drivers/media/v4l2-core/v4l2-async.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/media/v4l2-core/v4l2-async.c b/drivers/media/v4l2-core/v4l2-async.c index 5bada202b2d3..76996b516406 100644 --- a/drivers/media/v4l2-core/v4l2-async.c +++ b/drivers/media/v4l2-core/v4l2-async.c @@ -220,7 +220,14 @@ void v4l2_async_notifier_unregister(struct v4l2_async_notifier *notifier) v4l2_async_cleanup(sd); /* If we handled USB devices, we'd have to lock the parent too */ + /* + * If anyone calls v4l2_async_notifier_unregister() recursively from + * device_release_driver(), code will deadlock at list_lock, + * so unlock list_lock when device_release_driver() called. + */ + mutex_unlock(&list_lock); device_release_driver(d); + mutex_lock(&list_lock); if (notifier->unbind) notifier->unbind(notifier, sd, sd->asd); |