From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2A75E402BA9; Tue, 31 Mar 2026 16:44:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774975475; cv=none; b=J9vsljyl3ZNsnTipUkWxyWkJIqcTUe+4vJHkmvWUN+LdyJeZG+iF1Z9/lrmXc5pGt9uC08kn9HWNRBtESOrKGt7oJxSledU316kMnCbGGuLEPDywg86z4ut5T80lgYZaa/Sejh386KnIJHeRymBaraE0lb/1Io2j1BijIjpu9TI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774975475; c=relaxed/simple; bh=2YJOqLQ8ygEY4oV4jLzbqPLbe90AMzCyvJB5wQ+3YFE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=lm0tW38jSzMOWpvYeZKemoIH0cfmnYsw/P/KmMg8tUglnlypHYZZzGIQ5OiB3BTFwVnfCxSV44rRwEM/H3ASq6/dpaSmCd5BsGPOARz7Tu/dz6oabaRjIh1xlLRHlo4h3G3pUTUBdGpqFh6cIZoQM9yAx2ZGVMPvtmWfXsIy7JA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=WzV9jb1F; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="WzV9jb1F" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BD2C0C19424; Tue, 31 Mar 2026 16:44:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1774975475; bh=2YJOqLQ8ygEY4oV4jLzbqPLbe90AMzCyvJB5wQ+3YFE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=WzV9jb1FPMByd+fXZWoui1DJhNtEP3A0ZoNCMAX5x1QHnrPLlZ2E/yQfdBkOjJaWD SkHtdBAfy9sk3FwZfyg3R2zgY+IJ/H0BNrNyCF34gu37Sl/N+f5X/yfShYOx0MBAeh ZD47sV8POuUt68hL5rQdFYzA+ttV587o73oAizmo= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Mario Limonciello , "Mario Limonciello (AMD)" , Alex Deucher Subject: [PATCH 6.19 266/342] drm/amd/display: check if ext_caps is valid in BL setup Date: Tue, 31 Mar 2026 18:21:39 +0200 Message-ID: <20260331161808.737188076@linuxfoundation.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260331161758.909578033@linuxfoundation.org> References: <20260331161758.909578033@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.19-stable review patch. If anyone has any objections, please let me know. ------------------ From: Alex Deucher commit 9da4f9964abcaeb6e19797d5e3b10faad338a786 upstream. 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 Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -5406,7 +5406,7 @@ static void setup_backlight_device(struc 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);