The sysfb framebuffer handling only operates on graphics devices that provide the system's firmware framebuffer. If that device is not known, assume that any graphics device has been initialized by firmware.
Fixes a problem on i915 where sysfb does not release the firmware framebuffer after the native graphics driver loaded.
Reported-by: Borah, Chaitanya Kumar chaitanya.kumar.borah@intel.com Closes: https://lore.kernel.org/dri-devel/SJ1PR11MB6129EFB8CE63D1EF6D932F94B96F2@SJ1... Closes: https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/12160 Signed-off-by: Thomas Zimmermann tzimmermann@suse.de Fixes: b49420d6a1ae ("video/aperture: optionally match the device in sysfb_disable()") Cc: Javier Martinez Canillas javierm@redhat.com Cc: Thomas Zimmermann tzimmermann@suse.de Cc: Helge Deller deller@gmx.de Cc: Sam Ravnborg sam@ravnborg.org Cc: Daniel Vetter daniel.vetter@ffwll.ch Cc: Alex Deucher alexander.deucher@amd.com Cc: dri-devel@lists.freedesktop.org Cc: Linux regression tracking (Thorsten Leemhuis) regressions@leemhuis.info Cc: stable@vger.kernel.org # v6.11+ --- drivers/firmware/sysfb.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/firmware/sysfb.c b/drivers/firmware/sysfb.c index 02a07d3d0d40..a3df782fa687 100644 --- a/drivers/firmware/sysfb.c +++ b/drivers/firmware/sysfb.c @@ -67,9 +67,11 @@ static bool sysfb_unregister(void) void sysfb_disable(struct device *dev) { struct screen_info *si = &screen_info; + struct device *parent;
mutex_lock(&disable_lock); - if (!dev || dev == sysfb_parent_dev(si)) { + parent = sysfb_parent_dev(si); + if (!dev || !parent || dev == parent) { sysfb_unregister(); disabled = true; }