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,SPF_PASS,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 6CCBEC07E96 for ; Tue, 6 Jul 2021 12:13:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 544A2621BA for ; Tue, 6 Jul 2021 12:13:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235963AbhGFMPq (ORCPT ); Tue, 6 Jul 2021 08:15:46 -0400 Received: from mail.kernel.org ([198.145.29.99]:47622 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237160AbhGFLf6 (ORCPT ); Tue, 6 Jul 2021 07:35:58 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 363C461EB6; Tue, 6 Jul 2021 11:25:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1625570748; bh=nl0DIImT8XlHzu5yGB3APvkIojxXpccarwhQqQydqms=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=MJM55hsk6q+UsCMSX60RqRJEJ499M+J9FxemOq7o+6ti5x2LSC/CFkT9Mo4zmCOkG zi/3vkCAZMCibJJzZdo0Fmugy6Y5Ct5VNK+AKZMidDsPc9UPq3xS+9M6luayEkIy2l cCGdsiNCbOdjqnt559Dz2658Hpj2lt07HZ8I0fq5WY4ygdlF4WzFDVwL9pb2WSTbjM q/jwG7+pCve18osLRi7hx7kZHCPNNegB/PnmNW8UolmcztsDNVf45dQa5r2MlkUUoD sO6eUu7/OD/1U6vvPTfYfTzjUisLGyyozjP7HmVG13eOhskzwXr6aHzii2kk83NUID +eJSnfk0UJ8jA== 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 5.4 36/74] drm/amd/display: Release MST resources on switch from MST to SST Date: Tue, 6 Jul 2021 07:24:24 -0400 Message-Id: <20210706112502.2064236-36-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210706112502.2064236-1-sashal@kernel.org> References: <20210706112502.2064236-1-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 c18f39271b03..4bc95e9075e9 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 @@ -1284,6 +1284,8 @@ 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