6.12-stable review patch. If anyone has any objections, please let me know.
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From: Mathis Foerst mathis.foerst@mt.com
commit 298d1471cf83d5a2a05970e41822a2403f451086 upstream.
Getting / Setting the frame interval using the V4L2 subdev pad ops get_frame_interval/set_frame_interval causes a deadlock, as the subdev state is locked in the [1] but also in the driver itself.
In [2] it's described that the caller is responsible to acquire and release the lock in this case. Therefore, acquiring the lock in the driver is wrong.
Remove the lock acquisitions/releases from mt9m114_ifp_get_frame_interval() and mt9m114_ifp_set_frame_interval().
[1] drivers/media/v4l2-core/v4l2-subdev.c - line 1129 [2] Documentation/driver-api/media/v4l2-subdev.rst
Fixes: 24d756e914fc ("media: i2c: Add driver for onsemi MT9M114 camera sensor") Cc: stable@vger.kernel.org Signed-off-by: Mathis Foerst mathis.foerst@mt.com Reviewed-by: Laurent Pinchart laurent.pinchart@ideasonboard.com Signed-off-by: Sakari Ailus sakari.ailus@linux.intel.com Signed-off-by: Hans Verkuil hverkuil@xs4all.nl Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/media/i2c/mt9m114.c | 8 -------- 1 file changed, 8 deletions(-)
--- a/drivers/media/i2c/mt9m114.c +++ b/drivers/media/i2c/mt9m114.c @@ -1599,13 +1599,9 @@ static int mt9m114_ifp_get_frame_interva if (interval->which != V4L2_SUBDEV_FORMAT_ACTIVE) return -EINVAL;
- mutex_lock(sensor->ifp.hdl.lock); - ival->numerator = 1; ival->denominator = sensor->ifp.frame_rate;
- mutex_unlock(sensor->ifp.hdl.lock); - return 0; }
@@ -1624,8 +1620,6 @@ static int mt9m114_ifp_set_frame_interva if (interval->which != V4L2_SUBDEV_FORMAT_ACTIVE) return -EINVAL;
- mutex_lock(sensor->ifp.hdl.lock); - if (ival->numerator != 0 && ival->denominator != 0) sensor->ifp.frame_rate = min_t(unsigned int, ival->denominator / ival->numerator, @@ -1639,8 +1633,6 @@ static int mt9m114_ifp_set_frame_interva if (sensor->streaming) ret = mt9m114_set_frame_rate(sensor);
- mutex_unlock(sensor->ifp.hdl.lock); - return ret; }