Hans Verkuil 73a110623e
media: v4l2-core: push taking ioctl mutex down to ioctl handler ...
The ioctl serialization mutex (vdev->lock or q->lock for vb2 queues)
was taken at the highest level in v4l2-dev.c. This prevents more
fine-grained locking since at that level we cannot examine the ioctl
arguments, we can only do that after video_usercopy is called.
So push the locking down to __video_do_ioctl() and subdev_do_ioctl_lock().
This also allows us to make a few functions in v4l2-ioctl.c static and
video_usercopy() is no longer exported.
The locking scheme is not changed by this patch, just pushed down.
Signed-off-by: Hans Verkuil <hansverk@cisco.com >
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org >
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Hans Verkuil
73a110623e