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![Mauro Carvalho Chehab](/assets/img/avatar_default.png)
With the new API, a link can be either between two PADs or between an interface and an entity. So, we need to use a better name for the function that create links between two pads. So, rename the such function to media_create_pad_link(). No functional changes. This patch was created via this shell script: for i in $(find drivers/media -name '*.[ch]' -type f) $(find drivers/staging/media -name '*.[ch]' -type f) $(find include/ -name '*.h' -type f) ; do sed s,media_entity_create_link,media_create_pad_link,g <$i >a && mv a $i; done Acked-by: Hans Verkuil <hans.verkuil@cisco.com> Tested-by: Javier Martinez Canillas <javier@osg.samsung.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
793 lines
21 KiB
C
793 lines
21 KiB
C
/*
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* Media entity
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*
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* Copyright (C) 2010 Nokia Corporation
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*
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* Contacts: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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* Sakari Ailus <sakari.ailus@iki.fi>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/bitmap.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <media/media-entity.h>
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#include <media/media-device.h>
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/**
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* dev_dbg_obj - Prints in debug mode a change on some object
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*
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* @event_name: Name of the event to report. Could be __func__
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* @gobj: Pointer to the object
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*
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* Enabled only if DEBUG or CONFIG_DYNAMIC_DEBUG. Otherwise, it
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* won't produce any code.
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*/
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static inline const char *gobj_type(enum media_gobj_type type)
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{
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switch (type) {
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case MEDIA_GRAPH_ENTITY:
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return "entity";
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case MEDIA_GRAPH_PAD:
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return "pad";
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case MEDIA_GRAPH_LINK:
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return "link";
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default:
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return "unknown";
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}
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}
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static void dev_dbg_obj(const char *event_name, struct media_gobj *gobj)
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{
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#if defined(DEBUG) || defined (CONFIG_DYNAMIC_DEBUG)
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switch (media_type(gobj)) {
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case MEDIA_GRAPH_ENTITY:
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dev_dbg(gobj->mdev->dev,
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"%s: id 0x%08x entity#%d: '%s'\n",
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event_name, gobj->id, media_localid(gobj),
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gobj_to_entity(gobj)->name);
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break;
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case MEDIA_GRAPH_LINK:
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{
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struct media_link *link = gobj_to_link(gobj);
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dev_dbg(gobj->mdev->dev,
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"%s: id 0x%08x link#%d: '%s' %s#%d ==> '%s' %s#%d\n",
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event_name, gobj->id, media_localid(gobj),
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link->source->entity->name,
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gobj_type(media_type(&link->source->graph_obj)),
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media_localid(&link->source->graph_obj),
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link->sink->entity->name,
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gobj_type(media_type(&link->sink->graph_obj)),
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media_localid(&link->sink->graph_obj));
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break;
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}
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case MEDIA_GRAPH_PAD:
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{
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struct media_pad *pad = gobj_to_pad(gobj);
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dev_dbg(gobj->mdev->dev,
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"%s: id 0x%08x pad#%d: '%s':%d\n",
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event_name, gobj->id, media_localid(gobj),
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pad->entity->name, pad->index);
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}
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}
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#endif
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}
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/**
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* media_gobj_init - Initialize a graph object
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*
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* @mdev: Pointer to the media_device that contains the object
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* @type: Type of the object
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* @gobj: Pointer to the object
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*
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* This routine initializes the embedded struct media_gobj inside a
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* media graph object. It is called automatically if media_*_create()
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* calls are used. However, if the object (entity, link, pad, interface)
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* is embedded on some other object, this function should be called before
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* registering the object at the media controller.
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*/
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void media_gobj_init(struct media_device *mdev,
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enum media_gobj_type type,
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struct media_gobj *gobj)
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{
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gobj->mdev = mdev;
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/* Create a per-type unique object ID */
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switch (type) {
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case MEDIA_GRAPH_ENTITY:
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gobj->id = media_gobj_gen_id(type, ++mdev->entity_id);
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break;
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case MEDIA_GRAPH_PAD:
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gobj->id = media_gobj_gen_id(type, ++mdev->pad_id);
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break;
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case MEDIA_GRAPH_LINK:
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gobj->id = media_gobj_gen_id(type, ++mdev->link_id);
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break;
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}
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dev_dbg_obj(__func__, gobj);
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}
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/**
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* media_gobj_remove - Stop using a graph object on a media device
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*
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* @graph_obj: Pointer to the object
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*
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* This should be called at media_device_unregister_*() routines
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*/
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void media_gobj_remove(struct media_gobj *gobj)
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{
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dev_dbg_obj(__func__, gobj);
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}
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/**
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* media_entity_init - Initialize a media entity
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*
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* @num_pads: Total number of sink and source pads.
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* @pads: Array of 'num_pads' pads.
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*
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* The total number of pads is an intrinsic property of entities known by the
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* entity driver, while the total number of links depends on hardware design
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* and is an extrinsic property unknown to the entity driver. However, in most
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* use cases the number of links can safely be assumed to be equal to or
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* larger than the number of pads.
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*
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* For those reasons the links array can be preallocated based on the number
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* of pads and will be reallocated later if extra links need to be created.
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*
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* This function allocates a links array with enough space to hold at least
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* 'num_pads' elements. The media_entity::max_links field will be set to the
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* number of allocated elements.
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*
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* The pads array is managed by the entity driver and passed to
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* media_entity_init() where its pointer will be stored in the entity structure.
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*/
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int
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media_entity_init(struct media_entity *entity, u16 num_pads,
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struct media_pad *pads)
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{
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struct media_link *links;
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unsigned int max_links = num_pads;
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unsigned int i;
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links = kzalloc(max_links * sizeof(links[0]), GFP_KERNEL);
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if (links == NULL)
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return -ENOMEM;
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entity->group_id = 0;
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entity->max_links = max_links;
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entity->num_links = 0;
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entity->num_backlinks = 0;
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entity->num_pads = num_pads;
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entity->pads = pads;
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entity->links = links;
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for (i = 0; i < num_pads; i++) {
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pads[i].entity = entity;
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pads[i].index = i;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(media_entity_init);
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void
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media_entity_cleanup(struct media_entity *entity)
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{
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kfree(entity->links);
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}
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EXPORT_SYMBOL_GPL(media_entity_cleanup);
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/* -----------------------------------------------------------------------------
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* Graph traversal
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*/
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static struct media_entity *
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media_entity_other(struct media_entity *entity, struct media_link *link)
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{
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if (link->source->entity == entity)
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return link->sink->entity;
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else
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return link->source->entity;
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}
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/* push an entity to traversal stack */
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static void stack_push(struct media_entity_graph *graph,
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struct media_entity *entity)
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{
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if (graph->top == MEDIA_ENTITY_ENUM_MAX_DEPTH - 1) {
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WARN_ON(1);
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return;
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}
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graph->top++;
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graph->stack[graph->top].link = 0;
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graph->stack[graph->top].entity = entity;
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}
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static struct media_entity *stack_pop(struct media_entity_graph *graph)
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{
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struct media_entity *entity;
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entity = graph->stack[graph->top].entity;
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graph->top--;
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return entity;
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}
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#define link_top(en) ((en)->stack[(en)->top].link)
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#define stack_top(en) ((en)->stack[(en)->top].entity)
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/**
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* media_entity_graph_walk_start - Start walking the media graph at a given entity
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* @graph: Media graph structure that will be used to walk the graph
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* @entity: Starting entity
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*
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* This function initializes the graph traversal structure to walk the entities
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* graph starting at the given entity. The traversal structure must not be
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* modified by the caller during graph traversal. When done the structure can
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* safely be freed.
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*/
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void media_entity_graph_walk_start(struct media_entity_graph *graph,
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struct media_entity *entity)
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{
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graph->top = 0;
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graph->stack[graph->top].entity = NULL;
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bitmap_zero(graph->entities, MEDIA_ENTITY_ENUM_MAX_ID);
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if (WARN_ON(media_entity_id(entity) >= MEDIA_ENTITY_ENUM_MAX_ID))
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return;
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__set_bit(media_entity_id(entity), graph->entities);
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stack_push(graph, entity);
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}
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EXPORT_SYMBOL_GPL(media_entity_graph_walk_start);
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/**
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* media_entity_graph_walk_next - Get the next entity in the graph
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* @graph: Media graph structure
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*
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* Perform a depth-first traversal of the given media entities graph.
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*
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* The graph structure must have been previously initialized with a call to
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* media_entity_graph_walk_start().
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*
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* Return the next entity in the graph or NULL if the whole graph have been
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* traversed.
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*/
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struct media_entity *
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media_entity_graph_walk_next(struct media_entity_graph *graph)
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{
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if (stack_top(graph) == NULL)
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return NULL;
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/*
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* Depth first search. Push entity to stack and continue from
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* top of the stack until no more entities on the level can be
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* found.
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*/
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while (link_top(graph) < stack_top(graph)->num_links) {
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struct media_entity *entity = stack_top(graph);
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struct media_link *link = &entity->links[link_top(graph)];
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struct media_entity *next;
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/* The link is not enabled so we do not follow. */
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if (!(link->flags & MEDIA_LNK_FL_ENABLED)) {
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link_top(graph)++;
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continue;
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}
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/* Get the entity in the other end of the link . */
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next = media_entity_other(entity, link);
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if (WARN_ON(media_entity_id(next) >= MEDIA_ENTITY_ENUM_MAX_ID))
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return NULL;
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/* Has the entity already been visited? */
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if (__test_and_set_bit(media_entity_id(next), graph->entities)) {
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link_top(graph)++;
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continue;
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}
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/* Push the new entity to stack and start over. */
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link_top(graph)++;
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stack_push(graph, next);
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}
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return stack_pop(graph);
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}
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EXPORT_SYMBOL_GPL(media_entity_graph_walk_next);
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/* -----------------------------------------------------------------------------
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* Pipeline management
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*/
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/**
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* media_entity_pipeline_start - Mark a pipeline as streaming
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* @entity: Starting entity
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* @pipe: Media pipeline to be assigned to all entities in the pipeline.
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*
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* Mark all entities connected to a given entity through enabled links, either
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* directly or indirectly, as streaming. The given pipeline object is assigned to
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* every entity in the pipeline and stored in the media_entity pipe field.
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*
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* Calls to this function can be nested, in which case the same number of
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* media_entity_pipeline_stop() calls will be required to stop streaming. The
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* pipeline pointer must be identical for all nested calls to
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* media_entity_pipeline_start().
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*/
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__must_check int media_entity_pipeline_start(struct media_entity *entity,
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struct media_pipeline *pipe)
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{
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struct media_device *mdev = entity->parent;
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struct media_entity_graph graph;
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struct media_entity *entity_err = entity;
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int ret;
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mutex_lock(&mdev->graph_mutex);
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media_entity_graph_walk_start(&graph, entity);
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while ((entity = media_entity_graph_walk_next(&graph))) {
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DECLARE_BITMAP(active, MEDIA_ENTITY_MAX_PADS);
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DECLARE_BITMAP(has_no_links, MEDIA_ENTITY_MAX_PADS);
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unsigned int i;
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entity->stream_count++;
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WARN_ON(entity->pipe && entity->pipe != pipe);
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entity->pipe = pipe;
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/* Already streaming --- no need to check. */
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if (entity->stream_count > 1)
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continue;
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if (!entity->ops || !entity->ops->link_validate)
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continue;
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bitmap_zero(active, entity->num_pads);
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bitmap_fill(has_no_links, entity->num_pads);
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for (i = 0; i < entity->num_links; i++) {
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struct media_link *link = &entity->links[i];
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struct media_pad *pad = link->sink->entity == entity
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? link->sink : link->source;
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/* Mark that a pad is connected by a link. */
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bitmap_clear(has_no_links, pad->index, 1);
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/*
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* Pads that either do not need to connect or
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* are connected through an enabled link are
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* fine.
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*/
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if (!(pad->flags & MEDIA_PAD_FL_MUST_CONNECT) ||
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link->flags & MEDIA_LNK_FL_ENABLED)
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bitmap_set(active, pad->index, 1);
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/*
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* Link validation will only take place for
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* sink ends of the link that are enabled.
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*/
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if (link->sink != pad ||
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!(link->flags & MEDIA_LNK_FL_ENABLED))
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continue;
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ret = entity->ops->link_validate(link);
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if (ret < 0 && ret != -ENOIOCTLCMD) {
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dev_dbg(entity->parent->dev,
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"link validation failed for \"%s\":%u -> \"%s\":%u, error %d\n",
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link->source->entity->name,
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link->source->index,
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entity->name, link->sink->index, ret);
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goto error;
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}
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}
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/* Either no links or validated links are fine. */
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bitmap_or(active, active, has_no_links, entity->num_pads);
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if (!bitmap_full(active, entity->num_pads)) {
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ret = -EPIPE;
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dev_dbg(entity->parent->dev,
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"\"%s\":%u must be connected by an enabled link\n",
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entity->name,
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(unsigned)find_first_zero_bit(
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active, entity->num_pads));
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goto error;
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}
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}
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mutex_unlock(&mdev->graph_mutex);
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return 0;
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error:
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/*
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* Link validation on graph failed. We revert what we did and
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* return the error.
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*/
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media_entity_graph_walk_start(&graph, entity_err);
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while ((entity_err = media_entity_graph_walk_next(&graph))) {
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entity_err->stream_count--;
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if (entity_err->stream_count == 0)
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entity_err->pipe = NULL;
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/*
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* We haven't increased stream_count further than this
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* so we quit here.
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*/
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if (entity_err == entity)
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break;
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}
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mutex_unlock(&mdev->graph_mutex);
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return ret;
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}
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EXPORT_SYMBOL_GPL(media_entity_pipeline_start);
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/**
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* media_entity_pipeline_stop - Mark a pipeline as not streaming
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* @entity: Starting entity
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*
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* Mark all entities connected to a given entity through enabled links, either
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* directly or indirectly, as not streaming. The media_entity pipe field is
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* reset to NULL.
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*
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* If multiple calls to media_entity_pipeline_start() have been made, the same
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* number of calls to this function are required to mark the pipeline as not
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* streaming.
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*/
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void media_entity_pipeline_stop(struct media_entity *entity)
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{
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struct media_device *mdev = entity->parent;
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struct media_entity_graph graph;
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mutex_lock(&mdev->graph_mutex);
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media_entity_graph_walk_start(&graph, entity);
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while ((entity = media_entity_graph_walk_next(&graph))) {
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entity->stream_count--;
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if (entity->stream_count == 0)
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entity->pipe = NULL;
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}
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mutex_unlock(&mdev->graph_mutex);
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}
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EXPORT_SYMBOL_GPL(media_entity_pipeline_stop);
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/* -----------------------------------------------------------------------------
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* Module use count
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*/
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/*
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* media_entity_get - Get a reference to the parent module
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* @entity: The entity
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*
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* Get a reference to the parent media device module.
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*
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* The function will return immediately if @entity is NULL.
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*
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* Return a pointer to the entity on success or NULL on failure.
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*/
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struct media_entity *media_entity_get(struct media_entity *entity)
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{
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if (entity == NULL)
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return NULL;
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if (entity->parent->dev &&
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!try_module_get(entity->parent->dev->driver->owner))
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return NULL;
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return entity;
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}
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EXPORT_SYMBOL_GPL(media_entity_get);
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/*
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* media_entity_put - Release the reference to the parent module
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* @entity: The entity
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*
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* Release the reference count acquired by media_entity_get().
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*
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* The function will return immediately if @entity is NULL.
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*/
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void media_entity_put(struct media_entity *entity)
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{
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if (entity == NULL)
|
|
return;
|
|
|
|
if (entity->parent->dev)
|
|
module_put(entity->parent->dev->driver->owner);
|
|
}
|
|
EXPORT_SYMBOL_GPL(media_entity_put);
|
|
|
|
/* -----------------------------------------------------------------------------
|
|
* Links management
|
|
*/
|
|
|
|
static struct media_link *media_entity_add_link(struct media_entity *entity)
|
|
{
|
|
if (entity->num_links >= entity->max_links) {
|
|
struct media_link *links = entity->links;
|
|
unsigned int max_links = entity->max_links + 2;
|
|
unsigned int i;
|
|
|
|
links = krealloc(links, max_links * sizeof(*links), GFP_KERNEL);
|
|
if (links == NULL)
|
|
return NULL;
|
|
|
|
for (i = 0; i < entity->num_links; i++)
|
|
links[i].reverse->reverse = &links[i];
|
|
|
|
entity->max_links = max_links;
|
|
entity->links = links;
|
|
}
|
|
|
|
return &entity->links[entity->num_links++];
|
|
}
|
|
|
|
int
|
|
media_create_pad_link(struct media_entity *source, u16 source_pad,
|
|
struct media_entity *sink, u16 sink_pad, u32 flags)
|
|
{
|
|
struct media_link *link;
|
|
struct media_link *backlink;
|
|
|
|
BUG_ON(source == NULL || sink == NULL);
|
|
BUG_ON(source_pad >= source->num_pads);
|
|
BUG_ON(sink_pad >= sink->num_pads);
|
|
|
|
link = media_entity_add_link(source);
|
|
if (link == NULL)
|
|
return -ENOMEM;
|
|
|
|
link->source = &source->pads[source_pad];
|
|
link->sink = &sink->pads[sink_pad];
|
|
link->flags = flags;
|
|
|
|
/* Initialize graph object embedded at the new link */
|
|
media_gobj_init(source->parent, MEDIA_GRAPH_LINK, &link->graph_obj);
|
|
|
|
/* Create the backlink. Backlinks are used to help graph traversal and
|
|
* are not reported to userspace.
|
|
*/
|
|
backlink = media_entity_add_link(sink);
|
|
if (backlink == NULL) {
|
|
source->num_links--;
|
|
return -ENOMEM;
|
|
}
|
|
|
|
backlink->source = &source->pads[source_pad];
|
|
backlink->sink = &sink->pads[sink_pad];
|
|
backlink->flags = flags;
|
|
|
|
/* Initialize graph object embedded at the new link */
|
|
media_gobj_init(sink->parent, MEDIA_GRAPH_LINK, &backlink->graph_obj);
|
|
|
|
link->reverse = backlink;
|
|
backlink->reverse = link;
|
|
|
|
sink->num_backlinks++;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(media_create_pad_link);
|
|
|
|
void __media_entity_remove_links(struct media_entity *entity)
|
|
{
|
|
unsigned int i;
|
|
|
|
for (i = 0; i < entity->num_links; i++) {
|
|
struct media_link *link = &entity->links[i];
|
|
struct media_entity *remote;
|
|
unsigned int r = 0;
|
|
|
|
if (link->source->entity == entity)
|
|
remote = link->sink->entity;
|
|
else
|
|
remote = link->source->entity;
|
|
|
|
while (r < remote->num_links) {
|
|
struct media_link *rlink = &remote->links[r];
|
|
|
|
if (rlink != link->reverse) {
|
|
r++;
|
|
continue;
|
|
}
|
|
|
|
if (link->source->entity == entity)
|
|
remote->num_backlinks--;
|
|
|
|
if (--remote->num_links == 0)
|
|
break;
|
|
|
|
/* Insert last entry in place of the dropped link. */
|
|
*rlink = remote->links[remote->num_links];
|
|
}
|
|
}
|
|
|
|
entity->num_links = 0;
|
|
entity->num_backlinks = 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(__media_entity_remove_links);
|
|
|
|
void media_entity_remove_links(struct media_entity *entity)
|
|
{
|
|
/* Do nothing if the entity is not registered. */
|
|
if (entity->parent == NULL)
|
|
return;
|
|
|
|
mutex_lock(&entity->parent->graph_mutex);
|
|
__media_entity_remove_links(entity);
|
|
mutex_unlock(&entity->parent->graph_mutex);
|
|
}
|
|
EXPORT_SYMBOL_GPL(media_entity_remove_links);
|
|
|
|
static int __media_entity_setup_link_notify(struct media_link *link, u32 flags)
|
|
{
|
|
int ret;
|
|
|
|
/* Notify both entities. */
|
|
ret = media_entity_call(link->source->entity, link_setup,
|
|
link->source, link->sink, flags);
|
|
if (ret < 0 && ret != -ENOIOCTLCMD)
|
|
return ret;
|
|
|
|
ret = media_entity_call(link->sink->entity, link_setup,
|
|
link->sink, link->source, flags);
|
|
if (ret < 0 && ret != -ENOIOCTLCMD) {
|
|
media_entity_call(link->source->entity, link_setup,
|
|
link->source, link->sink, link->flags);
|
|
return ret;
|
|
}
|
|
|
|
link->flags = flags;
|
|
link->reverse->flags = link->flags;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* __media_entity_setup_link - Configure a media link
|
|
* @link: The link being configured
|
|
* @flags: Link configuration flags
|
|
*
|
|
* The bulk of link setup is handled by the two entities connected through the
|
|
* link. This function notifies both entities of the link configuration change.
|
|
*
|
|
* If the link is immutable or if the current and new configuration are
|
|
* identical, return immediately.
|
|
*
|
|
* The user is expected to hold link->source->parent->mutex. If not,
|
|
* media_entity_setup_link() should be used instead.
|
|
*/
|
|
int __media_entity_setup_link(struct media_link *link, u32 flags)
|
|
{
|
|
const u32 mask = MEDIA_LNK_FL_ENABLED;
|
|
struct media_device *mdev;
|
|
struct media_entity *source, *sink;
|
|
int ret = -EBUSY;
|
|
|
|
if (link == NULL)
|
|
return -EINVAL;
|
|
|
|
/* The non-modifiable link flags must not be modified. */
|
|
if ((link->flags & ~mask) != (flags & ~mask))
|
|
return -EINVAL;
|
|
|
|
if (link->flags & MEDIA_LNK_FL_IMMUTABLE)
|
|
return link->flags == flags ? 0 : -EINVAL;
|
|
|
|
if (link->flags == flags)
|
|
return 0;
|
|
|
|
source = link->source->entity;
|
|
sink = link->sink->entity;
|
|
|
|
if (!(link->flags & MEDIA_LNK_FL_DYNAMIC) &&
|
|
(source->stream_count || sink->stream_count))
|
|
return -EBUSY;
|
|
|
|
mdev = source->parent;
|
|
|
|
if (mdev->link_notify) {
|
|
ret = mdev->link_notify(link, flags,
|
|
MEDIA_DEV_NOTIFY_PRE_LINK_CH);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
ret = __media_entity_setup_link_notify(link, flags);
|
|
|
|
if (mdev->link_notify)
|
|
mdev->link_notify(link, flags, MEDIA_DEV_NOTIFY_POST_LINK_CH);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int media_entity_setup_link(struct media_link *link, u32 flags)
|
|
{
|
|
int ret;
|
|
|
|
mutex_lock(&link->source->entity->parent->graph_mutex);
|
|
ret = __media_entity_setup_link(link, flags);
|
|
mutex_unlock(&link->source->entity->parent->graph_mutex);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(media_entity_setup_link);
|
|
|
|
/**
|
|
* media_entity_find_link - Find a link between two pads
|
|
* @source: Source pad
|
|
* @sink: Sink pad
|
|
*
|
|
* Return a pointer to the link between the two entities. If no such link
|
|
* exists, return NULL.
|
|
*/
|
|
struct media_link *
|
|
media_entity_find_link(struct media_pad *source, struct media_pad *sink)
|
|
{
|
|
struct media_link *link;
|
|
unsigned int i;
|
|
|
|
for (i = 0; i < source->entity->num_links; ++i) {
|
|
link = &source->entity->links[i];
|
|
|
|
if (link->source->entity == source->entity &&
|
|
link->source->index == source->index &&
|
|
link->sink->entity == sink->entity &&
|
|
link->sink->index == sink->index)
|
|
return link;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(media_entity_find_link);
|
|
|
|
/**
|
|
* media_entity_remote_pad - Find the pad at the remote end of a link
|
|
* @pad: Pad at the local end of the link
|
|
*
|
|
* Search for a remote pad connected to the given pad by iterating over all
|
|
* links originating or terminating at that pad until an enabled link is found.
|
|
*
|
|
* Return a pointer to the pad at the remote end of the first found enabled
|
|
* link, or NULL if no enabled link has been found.
|
|
*/
|
|
struct media_pad *media_entity_remote_pad(struct media_pad *pad)
|
|
{
|
|
unsigned int i;
|
|
|
|
for (i = 0; i < pad->entity->num_links; i++) {
|
|
struct media_link *link = &pad->entity->links[i];
|
|
|
|
if (!(link->flags & MEDIA_LNK_FL_ENABLED))
|
|
continue;
|
|
|
|
if (link->source == pad)
|
|
return link->sink;
|
|
|
|
if (link->sink == pad)
|
|
return link->source;
|
|
}
|
|
|
|
return NULL;
|
|
|
|
}
|
|
EXPORT_SYMBOL_GPL(media_entity_remote_pad);
|