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drm/bridge: get the bridge returned by drm_bridge_get_prev_bridge()

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drm_bridge_get_prev_bridge() returns a bridge pointer that the
caller could hold for a long time. Increment the refcount of the returned
bridge and document it must be put by the caller.

Reviewed-by: Maxime Ripard <mripard@kernel.org>
Link: https://lore.kernel.org/r/20250709-drm-bridge-alloc-getput-drm_bridge_get_prev_bridge-v1-1-34ba6f395aaa@bootlin.com
Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
This commit is contained in:
Luca Ceresoli
2025-07-09 17:59:37 +02:00
parent 46c366851a
commit 9b75346e3c
1 changed files with 8 additions and 1 deletions
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9
include/drm/drm_bridge.h
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@@ -1321,6 +1321,13 @@ drm_bridge_get_next_bridge(struct drm_bridge *bridge)
* drm_bridge_get_prev_bridge() - Get the previous bridge in the chain
* @bridge: bridge object
*
* The caller is responsible of having a reference to @bridge via
* drm_bridge_get() or equivalent. This function leaves the refcount of
* @bridge unmodified.
*
* The refcount of the returned bridge is incremented. Use drm_bridge_put()
* when done with it.
*
* RETURNS:
* the previous bridge in the chain, or NULL if @bridge is the first.
*/
@@ -1330,7 +1337,7 @@ drm_bridge_get_prev_bridge(struct drm_bridge *bridge)
if (list_is_first(&bridge->chain_node, &bridge->encoder->bridge_chain))
return NULL;
return list_prev_entry(bridge, chain_node);
return drm_bridge_get(list_prev_entry(bridge, chain_node));
}
/**