6.11-stable review patch. If anyone has any objections, please let me know. ------------------ From: Thomas Zimmermann <tzimmermann@xxxxxxx> commit ad604f0a4c040dcb8faf44dc72db25e457c28076 upstream. 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@xxxxxxxxx> Closes: https://lore.kernel.org/dri-devel/SJ1PR11MB6129EFB8CE63D1EF6D932F94B96F2@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx/ Closes: https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/12160 Signed-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx> Fixes: b49420d6a1ae ("video/aperture: optionally match the device in sysfb_disable()") Cc: Javier Martinez Canillas <javierm@xxxxxxxxxx> Cc: Thomas Zimmermann <tzimmermann@xxxxxxx> Cc: Helge Deller <deller@xxxxxx> Cc: Sam Ravnborg <sam@xxxxxxxxxxxx> Cc: Daniel Vetter <daniel.vetter@xxxxxxxx> Cc: Alex Deucher <alexander.deucher@xxxxxxx> Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx Cc: Linux regression tracking (Thorsten Leemhuis) <regressions@xxxxxxxxxxxxx> Cc: <stable@xxxxxxxxxxxxxxx> # v6.11+ Acked-by: Alex Deucher <alexander.deucher@xxxxxxx> Reviewed-by: Javier Martinez Canillas <javierm@xxxxxxxxxx> Link: https://patchwork.freedesktop.org/patch/msgid/20240924084227.262271-1-tzimmermann@xxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/firmware/sysfb.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) --- 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; }
