diff options
| author | Sandor Yu <R01008@freescale.com> | 2015-05-29 17:07:04 +0800 |
|---|---|---|
| committer | Sandor Yu <R01008@freescale.com> | 2015-06-05 17:34:34 +0800 |
| commit | a4f33b0df1b0255c53e01aae9c00ab654fc273ef (patch) | |
| tree | 2a975d8a2cf4f9e6f72c692e1f26989fe0131d5a /drivers | |
| parent | 9572726009dfb9a485ab85a17dfa2993e9d2f4b3 (diff) | |
MLK-10256-02 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>
Diffstat (limited to 'drivers')
| -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 85a6a34128a8..a0dc460c9147 100644 --- a/drivers/media/v4l2-core/v4l2-async.c +++ b/drivers/media/v4l2-core/v4l2-async.c @@ -213,7 +213,14 @@ 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); |