atomisp/imx: Fix locking bug on error path

This was reported by Dan Carpenter. When we error with an IMX 227 we don't release
the lock and the sensor would then hang.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/media/atomisp/i2c/imx/imx.c b/drivers/staging/media/atomisp/i2c/imx/imx.c
index a73f90282c8942c7ffd8edacdcd78ca9554fa837..408a7b945153c9b2c4d6582e2e1355919be576af 100644 (file)
--- a/drivers/staging/media/atomisp/i2c/imx/imx.c
+++ b/drivers/staging/media/atomisp/i2c/imx/imx.c
@@ -454,8 +454,10 @@ static int imx_set_exposure_gain(struct v4l2_subdev *sd, u16 coarse_itg,
 
        if (dev->sensor_id == IMX227_ID) {
                ret = imx_write_reg_array(client, imx_param_hold);
-               if (ret)
+               if (ret) {
+                       mutex_unlock(&dev->input_lock);
                        return ret;
+               }
        }
 
        /* For imx175, setting gain must be delayed by one */