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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: Maxime 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: Luca Ceresoli <luca.ceresoli@bootlin.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.