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Inline drm_gem_pin() into its only caller drm_gem_map_attach() and update the documentation in the callback's purpose. Do the equivalent for drm_gem_unpin(). Also add stricter error checking on the involved locking. The pin operation in the GEM object functions is a helper for PRIME-exported buffer objects. Having drm_gem_pin() gives the impression of a general-purpose interface, which is not the case. Removing it makes the pin callback a bit harder to misuse. v2: - clarify comment on pin callback (Dmitry) Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Reviewed-by: Dmitry Osipenko <dmitry.osipenko@collabora.com> Link: https://lore.kernel.org/r/20250526132634.531789-5-tzimmermann@suse.de