[media] v4l: Don't access media entity after is has been destroyed
Entities associated with video device nodes are unregistered in video_unregister_device(). This destroys the entity even though it can still be accessed through open video device nodes. Move the media_device_unregister_entity() call from video_unregister_device() to v4l2_device_release() to ensure that the entity isn't unregistered until the last reference to the video device is released. Also remove the media_entity_get()/put() calls from v4l2-dev.c. Those functions were designed for subdevs, to avoid a parent module from being removed while still accessible through board code. They're not currently needed for video device nodes, and will oops when a hotpluggable device is disconnected during streaming, as media_entity_put() called in v4l2_device_release() tries to access entity->parent->dev->driver which is set to NULL when the device is disconnected. Signed-off-by: NLaurent Pinchart <laurent.pinchart@ideasonboard.com> Acked-by: NSakari Ailus <sakari.ailus@iki.fi> Acked-by: NHans Verkuil <hans.verkuil@cisco.com> Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>
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