Commit 4d2d2877 authored by Luca Ceresoli's avatar Luca Ceresoli
Browse files

drm/bridge: add a cleanup action for scope-based drm_bridge_put() invocation 



Many functions get a drm_bridge pointer, only use it in the function body
(or a smaller scope such as a loop body), and don't store it. In these
cases they always need to drm_bridge_put() it before returning (or exiting
the scope).

Some of those functions have complex code paths with multiple return points
or loop break/continue. This makes adding drm_bridge_put() in the right
places tricky, ugly and error prone in case of future code changes.

Others use the bridge pointer in the return statement and would need to
split the return line to fit the drm_bridge_put, which is a bit annoying:

  -return some_thing(bridge);
  +ret = some_thing(bridge);
  +drm_bridge_put(bridge);
  +return ret;

To make it easier for all of them to put the bridge reference correctly
without complicating code, define a scope-based cleanup action to be used
with __free().

Reviewed-by: default avatarMaxime Ripard <mripard@kernel.org>
Link: https://lore.kernel.org/r/20250708-drm-bridge-alloc-getput-drm_bridge_chain_get_first_bridge-v9-1-db1ba3df7f58@bootlin.com


Signed-off-by: default avatarLuca Ceresoli <luca.ceresoli@bootlin.com>
parent ac6e050e

include/drm/drm_bridge.h

+4 −0
Original line number Diff line number Diff line
@@ -23,6 +23,7 @@ 
#ifndef __DRM_BRIDGE_H__

#define __DRM_BRIDGE_H__



#include <linux/cleanup.h>

#include <linux/ctype.h>

#include <linux/list.h>

#include <linux/mutex.h>
@@ -1228,6 +1229,9 @@ drm_priv_to_bridge(struct drm_private_obj *priv) 
struct drm_bridge *drm_bridge_get(struct drm_bridge *bridge);

void drm_bridge_put(struct drm_bridge *bridge);



/* Cleanup action for use with __free() */

DEFINE_FREE(drm_bridge_put, struct drm_bridge *, if (_T) drm_bridge_put(_T))



void *__devm_drm_bridge_alloc(struct device *dev, size_t size, size_t offset,

			      const struct drm_bridge_funcs *funcs);