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DRM client's vmap/vunmap functions don't allow for multiple vmap operations. Calling drm_client_buffer_vmap() twice returns the same mapping, then calling drm_client_buffer_vunmap() twice already unmaps on the first call. This leads to unbalanced vmap refcounts. Fix this by calling drm_gem_vmap() unconditionally in drm_client_buffer_vmap(). All drivers that support DRM clients have to implement correct ref- counting for their vmap operations, or not vunmap at all. This is the case for drivers that use CMA, SHMEM and VRAM helpers, and QXL. Other drivers are not affected. Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Acked-by: Maxime Ripard <mripard@kernel.org> Link: https://patchwork.freedesktop.org/patch/msgid/20201120102545.4047-4-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.