From 218bf10e39ed5fb22a48dee40bfd2bbcb91693ba Mon Sep 17 00:00:00 2001 From: Hans Verkuil Date: Fri, 1 Mar 2019 06:11:27 -0500 Subject: 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 Reviewed-by: Laurent Pinchart Signed-off-by: Mauro Carvalho Chehab --- include/media/media-entity.h | 24 ------------------------ include/media/v4l2-subdev.h | 2 ++ 2 files changed, 2 insertions(+), 24 deletions(-) (limited to 'include/media') 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 @@ -864,19 +864,6 @@ 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 * @@ -916,17 +903,6 @@ __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 -- cgit v1.2.3-59-g8ed1b