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| author |   Sakari Ailus <sakari.ailus@linux.intel.com> | 2021-03-12 10:05:44 +0100 |
|---|---|---|
| committer |   Mauro Carvalho Chehab <mchehab+huawei@kernel.org> | 2021-04-06 14:35:14 +0200 |
| commit | 4ebddb7c17c4549f04741c7faf8e4ced62391d20 (patch) | |
| tree | 928c1a767c599fc03e08e0b641877ca3e8ab1353 /include/media | |
| parent | media: omap4iss: Acquire graph mutex for graph traversal (diff) | |
| download | linux-dev-4ebddb7c17c4549f04741c7faf8e4ced62391d20.tar.xz linux-dev-4ebddb7c17c4549f04741c7faf8e4ced62391d20.zip | |
media: entity: Add lockdep check to media graph walk
It was always assumed that walking the media graph would require holding
the media_device graph_mutex but this was not documented nor checked for.
Add a lockdep check to graph walk init and iter, and document the need for
acquiring the graph_mutex.
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Diffstat (limited to 'include/media')
| -rw-r--r-- | include/media/media-entity.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/media/media-entity.h b/include/media/media-entity.h index a90e2bf6baf7..09737b47881f 100644 --- a/include/media/media-entity.h +++ b/include/media/media-entity.h @@ -885,6 +885,11 @@ int media_entity_get_fwnode_pad(struct media_entity *entity, * * @graph: Media graph structure that will be used to walk the graph * @mdev: Pointer to the &media_device that contains the object + * + * The caller is required to hold the media_device graph_mutex during the graph + * walk until the graph state is released. + * + * Returns zero on success or a negative error code otherwise. */ __must_check int media_graph_walk_init( struct media_graph *graph, struct media_device *mdev); |