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media: entity: skip non-data link when removing reverse links

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The original implementation removes reverse links for any input link and
assumes the presense of sink/source.
It fails when the link is a not a data link.
media_entity_remove_links when there's an ancillary link can also fail.

We only need to remove reverse links for a data link.

Signed-off-by: Yunke Cao <yunkec@google.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
This commit is contained in:
Yunke Cao 2022-04-12 07:23:13 +01:00 committed by Mauro Carvalho Chehab
parent d8fdfc66cf
commit 6008dea1c7
1 changed files with 20 additions and 16 deletions
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36
drivers/media/mc/mc-entity.c
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@ -579,26 +579,30 @@ static void __media_entity_remove_link(struct media_entity *entity,
struct media_link *rlink, *tmp;
struct media_entity *remote;
if (link->source->entity == entity)
remote = link->sink->entity;
else
remote = link->source->entity;
list_for_each_entry_safe(rlink, tmp, &remote->links, list) {
if (rlink != link->reverse)
continue;
/* Remove the reverse links for a data link. */
if ((link->flags & MEDIA_LNK_FL_LINK_TYPE) == MEDIA_LNK_FL_DATA_LINK) {
if (link->source->entity == entity)
remote->num_backlinks--;
remote = link->sink->entity;
else
remote = link->source->entity;
/* Remove the remote link */
list_del(&rlink->list);
media_gobj_destroy(&rlink->graph_obj);
kfree(rlink);
list_for_each_entry_safe(rlink, tmp, &remote->links, list) {
if (rlink != link->reverse)
continue;
if (--remote->num_links == 0)
break;
if (link->source->entity == entity)
remote->num_backlinks--;
/* Remove the remote link */
list_del(&rlink->list);
media_gobj_destroy(&rlink->graph_obj);
kfree(rlink);
if (--remote->num_links == 0)
break;
}
}
list_del(&link->list);
media_gobj_destroy(&link->graph_obj);
kfree(link);