From nobody Sun Feb 8 19:03:51 2026 Received: from m16.mail.163.com (m16.mail.163.com [117.135.210.5]) (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 D4F2221ABB9; Fri, 16 Jan 2026 02:40:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=117.135.210.5 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768531236; cv=none; b=t6BjZ658VDpepY+MzZrNhlAiLHHL7AFmF4nXOXDtoLtKWPVEQHg8mLupWIWDN4/MqpC1NV9ivwIdVDXKS+3+iraUpZNZRs3Wucwnr+JI9uDVSmZmkjDj+/l+8ygHiHgS+0v4Ggevyx29fMuauIXYrIQyShWK7M/+uSbkz9Ottyk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768531236; c=relaxed/simple; bh=BMl6wYBEdAu/FmR8lpxBoYYXTmXk6bnUmky0WVbWwDM=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=rXrGdAXn9KqOjBhRDoCxKyBQbJ9axQBwoq50L0mF8N2VCiLcNinRbXDoRTIuTSD2t4DQ/a3p+NBy1U7XhdsI+DPj7eiFfyvIX3ct05MrCZv2iQMLLohh8Z80pJvPNN1233kDIzGoST/Td5bxJhzYwLh6+Hc7oJ3pqRg34OdWzZc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=163.com; spf=pass smtp.mailfrom=163.com; dkim=pass (1024-bit key) header.d=163.com header.i=@163.com header.b=Sm3Lg0qg; arc=none smtp.client-ip=117.135.210.5 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=163.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=163.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=163.com header.i=@163.com header.b="Sm3Lg0qg" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=163.com; s=s110527; h=From:To:Subject:Date:Message-Id:MIME-Version; bh=Z6 lZ+BrBAbLkCyZas3+4InPi/c+HxqLyNXj0gl5XhbA=; b=Sm3Lg0qgqcohu3EDjW hkTTZy8F2wkA3Fu7E4mhMk4Lb3TxVtuBzrYgyPC0K3Wl6NHimvnlXPtKJsJo8pgZ UYMc/sc08LJDq0V677MAkHROMXhFCP+LUdOl6uE1W6DVASYHlDeAJYYv7p6K8Iza DPBf7Y5AS5PnYQdWVUo4lbz8A= Received: from pek-lpg-core6.wrs.com (unknown []) by gzga-smtp-mtada-g0-1 (Coremail) with SMTP id _____wDHCBT9pGlpqauOFw--.661S2; Fri, 16 Jan 2026 10:39:59 +0800 (CST) From: Rahul Sharma To: gregkh@linuxfoundation.org, stable@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Alex Hung , Mario Limonciello , Alex Deucher , Aurabindo Pillai , Rahul Sharma Subject: [PATCH v6.6] drm/amd/display: Check dce_hwseq before dereferencing it Date: Fri, 16 Jan 2026 10:39:56 +0800 Message-Id: <20260116023956.142238-1-black.hawk@163.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: _____wDHCBT9pGlpqauOFw--.661S2 X-Coremail-Antispam: 1Uf129KBjvJXoW7ur17Gr4UGFyUJry5Xw1kKrg_yoW8Ww1kpr s3Gr1rJ397Z3WUZa4DJF18ZFWUWaykXF4fGFsrA3Z5ur9IyFW0qr98ArsrGrykuFn8Z3Wa qF13GFyxtF1akrDanT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDUYxBIdaVFxhVjvjDU0xZFpf9x0pR45dNUUUUU= X-CM-SenderInfo: 5eoduy4okd4yi6rwjhhfrp/xtbC3h8dtmlppP+SZwAA3E Content-Type: text/plain; charset="utf-8" From: Alex Hung [ Upstream b669507b637eb6b1aaecf347f193efccc65d756e commit ] [WHAT] hws was checked for null earlier in dce110_blank_stream, indicating hws can be null, and should be checked whenever it is used. Cc: Mario Limonciello Cc: Alex Deucher Reviewed-by: Aurabindo Pillai Signed-off-by: Alex Hung Signed-off-by: Aurabindo Pillai Signed-off-by: Alex Deucher (cherry picked from commit 79db43611ff61280b6de58ce1305e0b2ecf675ad) Cc: stable@vger.kernel.org Signed-off-by: Rahul Sharma --- drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c b/= drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c index d389eeb264a7..fb18a2a9378c 100644 --- a/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c +++ b/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c @@ -1228,7 +1228,7 @@ void dce110_blank_stream(struct pipe_ctx *pipe_ctx) struct dce_hwseq *hws =3D link->dc->hwseq; =20 if (link->local_sink && link->local_sink->sink_signal =3D=3D SIGNAL_TYPE_= EDP) { - if (!link->skip_implict_edp_power_control) + if (!link->skip_implict_edp_power_control && hws) hws->funcs.edp_backlight_control(link, false); link->dc->hwss.set_abm_immediate_disable(pipe_ctx); } --=20 2.34.1