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Functions in the atomic commit tail are not allowed to acquire the dmabuf's reservation lock. So we cannot legally call the GEM object's vmap functionality in atomic_update. Instead use struct drm_shadow_plane_state and friends. It vmaps the framebuffer BOs in prepare_fb and vunmaps them in cleanup_fb. The cursor plane state stores the mapping's address. The pinning of the BO is implicitly done by vmap. As an extra benefit, there's no source of runtime errors left in atomic_update. v2: * rebase patch onto struct drm_shadow_plane_state Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Reviewed-by: Hans de Goede <hdegoede@redhat.com> Tested-by: Hans de Goede <hdegoede@redhat.com> Link: https://patchwork.freedesktop.org/patch/msgid/20210209121042.24098-3-tzimmermann@suse.de