From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-20.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E2BC9C49EA7 for ; Tue, 6 Jul 2021 11:39:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D015861E56 for ; Tue, 6 Jul 2021 11:39:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239327AbhGFLl1 (ORCPT ); Tue, 6 Jul 2021 07:41:27 -0400 Received: from mail.kernel.org ([198.145.29.99]:35340 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234610AbhGFL2O (ORCPT ); Tue, 6 Jul 2021 07:28:14 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id E2EFE61D64; Tue, 6 Jul 2021 11:20:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1625570409; bh=6ZYdAhuM70l8e7NN6tetSVtVoE0dUNL1aeYN0bqoLX8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=dDPHhXbJxCH7gSLjCU/0oy9RVlAYvzvsRgsvKefnO7HdCyrYa4L0rA9mDJ9C8K02s lOrV1/6bJj5pZfcxysDU2WR4Gb56cydbhLVkpCVTDMhT07L4N0Q8+Gw/Qik2xZapWg U0ke8X6JkxVunLZFNPpCzGSmsGRPvr4h0VVU4OtNMP29MftIwMZN25bdNufHi4lcZh yk4tcRc2tyAMvJpNRNar14n5kybfoJ/AAwAtjqyGPp4zc3dO0sFGvNQ6Wbwg+9KiDg CfIsWGq+hPxVNsIT0/yOu5nMABG6fIkQICbi9Y/9RayfsgDgUZngsRlkztCf6D+Rgl PMSjIvpGgGYgw== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Vladimir Stempen , Wenjing Liu , Stylon Wang , Daniel Wheeler , Alex Deucher , Sasha Levin , amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org Subject: [PATCH AUTOSEL 5.12 077/160] drm/amd/display: Release MST resources on switch from MST to SST Date: Tue, 6 Jul 2021 07:17:03 -0400 Message-Id: <20210706111827.2060499-77-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210706111827.2060499-1-sashal@kernel.org> References: <20210706111827.2060499-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Vladimir Stempen [ Upstream commit 3f8518b60c10aa96f3efa38a967a0b4eb9211ac0 ] [why] When OS overrides training link training parameters for MST device to SST mode, MST resources are not released and leak of the resource may result crash and incorrect MST discovery during following hot plugs. [how] Retaining sink object to be reused by SST link and releasing MST resources. Signed-off-by: Vladimir Stempen Reviewed-by: Wenjing Liu Acked-by: Stylon Wang Tested-by: Daniel Wheeler Signed-off-by: Alex Deucher Signed-off-by: Sasha Levin --- drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c index c1391bfb7a9b..208454df17d7 100644 --- a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c +++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c @@ -1726,6 +1726,8 @@ static void set_dp_mst_mode(struct dc_link *link, bool mst_enable) link->type = dc_connection_single; link->local_sink = link->remote_sinks[0]; link->local_sink->sink_signal = SIGNAL_TYPE_DISPLAY_PORT; + dc_sink_retain(link->local_sink); + dm_helpers_dp_mst_stop_top_mgr(link->ctx, link); } else if (mst_enable == true && link->type == dc_connection_single && link->remote_sinks[0] != NULL) { -- 2.30.2