diff options
| author | Luca Ceresoli <luca.ceresoli@bootlin.com> | 2025-12-16 18:58:34 +0100 |
|---|---|---|
| committer | Luca Ceresoli <luca.ceresoli@bootlin.com> | 2025-12-30 10:11:32 +0100 |
| commit | 293a8fd7721a90987d9bf149feab60e756dac269 (patch) | |
| tree | 14c064a35c49446715a1225a20f9ee7505282067 /drivers/gpu | |
| parent | 130343ee6bca9895c47d314467db7dd3dcc8bc35 (diff) | |
| download | linux-next-293a8fd7721a90987d9bf149feab60e756dac269.tar.gz linux-next-293a8fd7721a90987d9bf149feab60e756dac269.zip | |
drm/bridge: add of_drm_find_and_get_bridge()
of_drm_find_bridge() does not increment the refcount for the returned
bridge, but that is required now. However converting it and all its users
is not realistically doable at once given the large amount of (direct and
indirect) callers and the complexity of some.
Solve this issue by creating a new of_drm_find_and_get_bridge() function
that is identical to of_drm_find_bridge() except also it takes a
reference. Then of_drm_find_bridge() will be deprecated to be eventually
removed.
Suggested-by: Maxime Ripard <mripard@kernel.org>
Link: https://lore.kernel.org/dri-devel/20250319-stylish-lime-mongoose-0a18ad@houat/
Reviewed-by: Maxime Ripard <mripard@kernel.org>
Link: https://patch.msgid.link/20251216-drm-bridge-alloc-getput-drm_of_find_bridge-v3-1-b5165fab8058@bootlin.com
Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/drm/drm_bridge.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c index db40c26d1cb3..0dbc8b59c3be 100644 --- a/drivers/gpu/drm/drm_bridge.c +++ b/drivers/gpu/drm/drm_bridge.c @@ -1480,6 +1480,31 @@ EXPORT_SYMBOL_GPL(drm_bridge_hpd_notify); #ifdef CONFIG_OF /** + * of_drm_find_and_get_bridge - find the bridge corresponding to the device + * node in the global bridge list + * @np: device node + * + * The refcount of the returned bridge is incremented. Use drm_bridge_put() + * when done with it. + * + * RETURNS: + * drm_bridge control struct on success, NULL on failure + */ +struct drm_bridge *of_drm_find_and_get_bridge(struct device_node *np) +{ + struct drm_bridge *bridge; + + scoped_guard(mutex, &bridge_lock) { + list_for_each_entry(bridge, &bridge_list, list) + if (bridge->of_node == np) + return drm_bridge_get(bridge); + } + + return NULL; +} +EXPORT_SYMBOL(of_drm_find_and_get_bridge); + +/** * of_drm_find_bridge - find the bridge corresponding to the device node in * the global bridge list * |