hwmon: (w83627ehf) Fix negative 8-bit temperature values

[pandora-kernel.git] / drivers / media / video / v4l2-dev.c

diff --git a/drivers/media/video/v4l2-dev.c b/drivers/media/video/v4l2-dev.c
index 06f1400..d721565 100644 (file)
--- a/drivers/media/video/v4l2-dev.c
+++ b/drivers/media/video/v4l2-dev.c
@@ -173,6 +173,17 @@ static void v4l2_device_release(struct device *cd)
                media_device_unregister_entity(&vdev->entity);
 #endif
 
+       /* Do not call v4l2_device_put if there is no release callback set.
+        * Drivers that have no v4l2_device release callback might free the
+        * v4l2_dev instance in the video_device release callback below, so we
+        * must perform this check here.
+        *
+        * TODO: In the long run all drivers that use v4l2_device should use the
+        * v4l2_device release callback. This check will then be unnecessary.
+        */
+       if (v4l2_dev->release == NULL)
+               v4l2_dev = NULL;
+
        /* Release video_device and perform other
           cleanups as needed. */
        vdev->release(vdev);