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drm/bridge: Add devm_drm_bridge_add() 

This adds a devm managed version of drm_bridge_add(). Like other
"devm" function listed in drm_bridge.h, this function takes an
explicit "dev" to use for the lifetime management. A few notes:
* In general we have a "struct device" for bridges that makes a good
  candidate for where the lifetime matches exactly what we want.
* The "bridge->dev->dev" device appears to be the encoder
  device. That's not the right device to use for lifetime management.

Suggested-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20220510122726.v3.3.Iba4b9bf6c7a1ee5ea2835ad7bd5eaf84d7688520@changeid
This commit is contained in:
Douglas Anderson 2022-05-10 12:29:43 -07:00
parent 3800b17109
commit 50e156bd8a
2 changed files with 24 additions and 0 deletions
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23
drivers/gpu/drm/drm_bridge.c
View File

@ -170,6 +170,29 @@ void drm_bridge_add(struct drm_bridge *bridge)
}
EXPORT_SYMBOL(drm_bridge_add);
static void drm_bridge_remove_void(void *bridge)
{
drm_bridge_remove(bridge);
}
/**
* devm_drm_bridge_add - devm managed version of drm_bridge_add()
*
* @dev: device to tie the bridge lifetime to
* @bridge: bridge control structure
*
* This is the managed version of drm_bridge_add() which automatically
* calls drm_bridge_remove() when @dev is unbound.
*
* Return: 0 if no error or negative error code.
*/
int devm_drm_bridge_add(struct device *dev, struct drm_bridge *bridge)
{
drm_bridge_add(bridge);
return devm_add_action_or_reset(dev, drm_bridge_remove_void, bridge);
}
EXPORT_SYMBOL(devm_drm_bridge_add);
/**
* drm_bridge_remove - remove the given bridge from the global bridge list
*

1
include/drm/drm_bridge.h
View File

@ -796,6 +796,7 @@ drm_priv_to_bridge(struct drm_private_obj *priv)
}
void drm_bridge_add(struct drm_bridge *bridge);
int devm_drm_bridge_add(struct device *dev, struct drm_bridge *bridge);
void drm_bridge_remove(struct drm_bridge *bridge);
int drm_bridge_attach(struct drm_encoder *encoder, struct drm_bridge *bridge,
struct drm_bridge *previous,