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Synchronize CPU access to GEM BOs with other drivers when updating the screen buffer. Imported buffers might otherwise contain stale data. Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Reviewed-by: Javier Martinez Canillas <javierm@redhat.com> Link: https://patchwork.freedesktop.org/patch/msgid/20220922130944.27138-6-tzimmermann@suse.de