Commit 89b14485 authored by Ezequiel Garcia's avatar Ezequiel Garcia Committed by Mauro Carvalho Chehab
Browse files

media: imx: Fix csc/scaler unregister 



The csc/scaler device private struct is released by
ipu_csc_scaler_video_device_release(), which can be called
by video_unregister_device() if there are no users
of the underlying struct video device.

Therefore, the mutex can't be held when calling
video_unregister_device() as its memory may be freed
by it, leading to a kernel oops.

Fortunately, the fix is quite simple as no locking
is needed when calling video_unregister_device(): v4l2-core
already has its own internal locking, and the structures
are also properly refcounted.

Fixes: a8ef0488 ("media: imx: add csc/scaler mem2mem device")
Signed-off-by: default avatarEzequiel Garcia <ezequiel@collabora.com>
Reviewed-by: default avatarPhilipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: default avatarHans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab+huawei@kernel.org>
parent bb221654

drivers/staging/media/imx/imx-media-csc-scaler.c

+0 −4
Original line number Diff line number Diff line
@@ -869,11 +869,7 @@ void imx_media_csc_scaler_device_unregister(struct imx_media_video_dev *vdev) 
	struct ipu_csc_scaler_priv *priv = vdev_to_priv(vdev);

	struct video_device *vfd = priv->vdev.vfd;



	mutex_lock(&priv->mutex);



	video_unregister_device(vfd);



	mutex_unlock(&priv->mutex);

}



struct imx_media_video_dev *