From: Alex Deucher Date: Fri, 20 Mar 2026 16:33:48 +0000 (-0400) Subject: drm/amd/display: check if ext_caps is valid in BL setup X-Git-Tag: v7.0-rc6~19^2~4^2~4 X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=9da4f9964abcaeb6e19797d5e3b10faad338a786;p=thirdparty%2Fkernel%2Fstable.git drm/amd/display: check if ext_caps is valid in BL setup LVDS connectors don't have extended backlight caps so check if the pointer is valid before accessing it. Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/5012 Fixes: 1454642960b0 ("drm/amd: Re-introduce property to control adaptive backlight modulation") Cc: Mario Limonciello Reviewed-by: Mario Limonciello (AMD) Signed-off-by: Alex Deucher (cherry picked from commit 3f797396d7f4eb9bb6eded184bbc6f033628a6f6) Cc: stable@vger.kernel.org --- diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c index acc3d8dad4a38..2328c1aa0ead1 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -5423,7 +5423,7 @@ static void setup_backlight_device(struct amdgpu_display_manager *dm, caps = &dm->backlight_caps[aconnector->bl_idx]; /* Only offer ABM property when non-OLED and user didn't turn off by module parameter */ - if (!caps->ext_caps->bits.oled && amdgpu_dm_abm_level < 0) + if (caps->ext_caps && !caps->ext_caps->bits.oled && amdgpu_dm_abm_level < 0) drm_object_attach_property(&aconnector->base.base, dm->adev->mode_info.abm_level_property, ABM_SYSFS_CONTROL);