media: v4l2-subdev: add release() internal op

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If the subdevice created a device node, then the v4l2_subdev cannot
be freed until the last user of the device node closes it.

This means that we need a release() callback in v4l2_subdev_internal_ops
that is called from the video_device release function so the subdevice
driver can postpone freeing memory until the that callback is called.

If no video device node was created then the release callback can
be called immediately when the subdev is unregistered.

Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

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Hans Verkuil 2019-02-21 08:37:42 -05:00 • committed by Mauro Carvalho Chehab

parent ea6c7e34f3

commit 0e43734d4c

2 changed files with 26 additions and 6 deletions

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19

drivers/media/v4l2-core/v4l2-device.c

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13

include/media/v4l2-subdev.h

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