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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 /drivers/media/mc | |
| parent | media: omap4iss: Acquire graph mutex for graph traversal (diff) | |
| download | linux-4ebddb7c17c4549f04741c7faf8e4ced62391d20.tar.xz linux-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 'drivers/media/mc')
| -rw-r--r-- | drivers/media/mc/mc-entity.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/media/mc/mc-entity.c b/drivers/media/mc/mc-entity.c index 12b45e669bcc..678b99771cfa 100644 --- a/drivers/media/mc/mc-entity.c +++ b/drivers/media/mc/mc-entity.c @@ -340,6 +340,7 @@ static void media_graph_walk_iter(struct media_graph *graph) stack_push(graph, next); dev_dbg(entity->graph_obj.mdev->dev, "walk: pushing '%s' on stack\n", next->name); + lockdep_assert_held(&entity->graph_obj.mdev->graph_mutex); } struct media_entity *media_graph_walk_next(struct media_graph *graph) |