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drm/bridge: add devm_drm_put_bridge()

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Bridges obtained via devm_drm_bridge_alloc(dev, ...) will be put when the
requesting device (@dev) is removed.

However drivers which obtained them may need to put the obtained reference
explicitly. One such case is if they bind the devm removal action to a
different device than the one implemented by the driver itself and which
might be removed at a different time, such as bridge/panel.c.

Add devm_drm_put_bridge() to manually release a devm-obtained bridge in
such cases.

This function is considered only a temporary workaround until the panel
bridge is reworked and should be removed afterwards.

Acked-by: Maxime Ripard <mripard@kernel.org>
Link: https://lore.kernel.org/r/20250509-drm-bridge-convert-to-alloc-api-v3-20-b8bc1f16d7aa@bootlin.com
Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
This commit is contained in:
Luca Ceresoli 2025-05-09 15:53:46 +02:00
parent afb903c01b
commit 5164553d73
2 changed files with 21 additions and 0 deletions
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17
drivers/gpu/drm/drm_bridge.c
View file

@ -1392,6 +1392,23 @@ struct drm_bridge *of_drm_find_bridge(struct device_node *np)
EXPORT_SYMBOL(of_drm_find_bridge);
#endif
/**
* devm_drm_put_bridge - Release a bridge reference obtained via devm
* @dev: device that got the bridge via devm
* @bridge: pointer to a struct drm_bridge obtained via devm
*
* Same as drm_bridge_put() for bridge pointers obtained via devm functions
* such as devm_drm_bridge_alloc().
*
* This function is a temporary workaround and MUST NOT be used. Manual
* handling of bridge lifetime is inherently unsafe.
*/
void devm_drm_put_bridge(struct device *dev, struct drm_bridge *bridge)
{
devm_release_action(dev, drm_bridge_put_void, bridge);
}
EXPORT_SYMBOL(devm_drm_put_bridge);
static void drm_bridge_debugfs_show_bridge(struct drm_printer *p,
struct drm_bridge *bridge,
unsigned int idx)

4
include/drm/drm_bridge.h
View file

@ -1311,6 +1311,8 @@ static inline struct drm_bridge *devm_drm_of_get_bridge(struct device *dev,
return ERR_PTR(-ENODEV);
}
static inline void devm_drm_put_bridge(struct device *dev, struct drm_bridge *bridge) {}
static inline struct drm_bridge *drmm_of_get_bridge(struct drm_device *drm,
struct device_node *node,
u32 port,
@ -1320,6 +1322,8 @@ static inline struct drm_bridge *drmm_of_get_bridge(struct drm_device *drm,
}
#endif
void devm_drm_put_bridge(struct device *dev, struct drm_bridge *bridge);
void drm_bridge_debugfs_params(struct dentry *root);
void drm_bridge_debugfs_encoder_params(struct dentry *root, struct drm_encoder *encoder);