From patchwork Tue Jan 18 16:05:48 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 533515 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8E13BC433FE for ; Tue, 18 Jan 2022 16:09:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243041AbiARQJs (ORCPT ); Tue, 18 Jan 2022 11:09:48 -0500 Received: from dfw.source.kernel.org ([139.178.84.217]:39512 "EHLO dfw.source.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1346846AbiARQIw (ORCPT ); Tue, 18 Jan 2022 11:08:52 -0500 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 427836128A; Tue, 18 Jan 2022 16:08:52 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 04418C00446; Tue, 18 Jan 2022 16:08:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1642522131; bh=qju8o6XoyuGz22CvsF0euEAzaQbEcSDw/wMlTLltAoI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=VSOffEJqdtvc9WAWxlkK5Mbh3IWPDViFye/0Ly7rDbYHO1OVfZBc16e2fbkHeTdkL 9l83sFs9/IPWpDt4PP2Flcccks3XwDAnaB7MXTPCCEHrPpcyZHIvVb9WFc8td4cL2P dEKGCQdT6FtfAuKkJysMId89R5VWBSAa1oLi5V5A= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Mario Limonciello , Alex Deucher Subject: [PATCH 5.15 02/28] drm/amd/display: explicitly set is_dsc_supported to false before use Date: Tue, 18 Jan 2022 17:05:48 +0100 Message-Id: <20220118160451.957799245@linuxfoundation.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220118160451.879092022@linuxfoundation.org> References: <20220118160451.879092022@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Mario Limonciello commit 63ad5371cd1e379519395c49a4b6a652c36c98e5 upstream. When UBSAN is enabled a case is shown on unplugging the display that this variable hasn't been initialized by `update_dsc_caps`, presumably when the display was unplugged it wasn't copied from the DPCD. Link: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1956497 Signed-off-by: Mario Limonciello Acked-by: Alex Deucher Signed-off-by: Alex Deucher Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 1 + 1 file changed, 1 insertion(+) --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -5604,6 +5604,7 @@ static void update_dsc_caps(struct amdgp struct dsc_dec_dpcd_caps *dsc_caps) { stream->timing.flags.DSC = 0; + dsc_caps->is_dsc_supported = false; if (aconnector->dc_link && sink->sink_signal == SIGNAL_TYPE_DISPLAY_PORT) { dc_dsc_parse_dsc_dpcd(aconnector->dc_link->ctx->dc,