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Do not acquire a reference on the module that provides a client's callback functions in drm_client_init(). The additional reference prevents the user from unloading the callback functions' module and thus creating dangling pointers. This is only necessary if there is no direct dependency between the caller of drm_client_init() and the provider of the callbacks in struct drm_client_funcs. If this case ever existed, it has been removed from the DRM code. Callers of drm_client_init() also provide the callback implementation. The lifetime of the clients is tied to the dependency chain's outer-most module, which is the hardware's DRM driver. Before client helpers could be unloaded, the driver module would have to be unloaded, which also unregisters all clients. Driver modules that set up DRM clients can now be unloaded. Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Acked-by: Javier Martinez Canillas <javierm@redhat.com> Link: https://patchwork.freedesktop.org/patch/msgid/20231102131056.7256-2-tzimmermann@suse.de
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 Restructured Text 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.