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| author | Hans Verkuil <hverkuil-cisco@xs4all.nl> | 2019-03-01 06:11:27 -0500 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab+samsung@kernel.org> | 2019-03-19 13:29:37 -0400 |
| commit | 218bf10e39ed5fb22a48dee40bfd2bbcb91693ba (patch) | |
| tree | fae09b667509e0ed99447119c42b359186350360 /include/media | |
| parent | 0e43734d4c46e156785bb1d2acc5b3c10b7d5dd5 (diff) | |
| download | linux-218bf10e39ed5fb22a48dee40bfd2bbcb91693ba.tar.gz linux-218bf10e39ed5fb22a48dee40bfd2bbcb91693ba.tar.bz2 linux-218bf10e39ed5fb22a48dee40bfd2bbcb91693ba.zip | |
media: v4l2-subdev: handle module refcounting here
The module ownership refcounting was done in media_entity_get/put,
but that was very confusing and it did not work either in case an
application had a v4l-subdevX device open and the module was
unbound. When the v4l-subdevX device was closed the media_entity_put
was never called and the module refcount was left one too high, making
it impossible to unload it.
Since v4l2-subdev.c was the only place where media_entity_get/put was
called, just move the functionality to v4l2-subdev.c and drop those
confusing entity functions.
Store the module in subdev_fh so module_put no longer depends on
the media_entity struct.
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>
Diffstat (limited to 'include/media')
| -rw-r--r-- | include/media/media-entity.h | 24 | ||||
| -rw-r--r-- | include/media/v4l2-subdev.h | 2 |
2 files changed, 2 insertions, 24 deletions
diff --git a/include/media/media-entity.h b/include/media/media-entity.h index e5f6960d92f6..3cbad42e3693 100644 --- a/include/media/media-entity.h +++ b/include/media/media-entity.h @@ -865,19 +865,6 @@ struct media_link *media_entity_find_link(struct media_pad *source, struct media_pad *media_entity_remote_pad(const struct media_pad *pad); /** - * media_entity_get - Get a reference to the parent module - * - * @entity: The entity - * - * Get a reference to the parent media device module. - * - * The function will return immediately if @entity is %NULL. - * - * Return: returns a pointer to the entity on success or %NULL on failure. - */ -struct media_entity *media_entity_get(struct media_entity *entity); - -/** * media_entity_get_fwnode_pad - Get pad number from fwnode * * @entity: The entity @@ -917,17 +904,6 @@ __must_check int media_graph_walk_init( void media_graph_walk_cleanup(struct media_graph *graph); /** - * media_entity_put - Release the reference to the parent module - * - * @entity: The entity - * - * Release the reference count acquired by media_entity_get(). - * - * The function will return immediately if @entity is %NULL. - */ -void media_entity_put(struct media_entity *entity); - -/** * media_graph_walk_start - Start walking the media graph at a * given entity * diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h index e807aa96ed3b..a7fa5b80915a 100644 --- a/include/media/v4l2-subdev.h +++ b/include/media/v4l2-subdev.h @@ -910,9 +910,11 @@ struct v4l2_subdev { * * @vfh: pointer to &struct v4l2_fh * @pad: pointer to &struct v4l2_subdev_pad_config + * @owner: module pointer to the owner of this file handle */ struct v4l2_subdev_fh { struct v4l2_fh vfh; + struct module *owner; #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API) struct v4l2_subdev_pad_config *pad; #endif |