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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D7CF5C6FA99 for ; Fri, 10 Mar 2023 15:30:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234239AbjCJPaG (ORCPT ); Fri, 10 Mar 2023 10:30:06 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44968 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234353AbjCJP3r (ORCPT ); Fri, 10 Mar 2023 10:29:47 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id ED0BE22130 for ; Fri, 10 Mar 2023 07:18:15 -0800 (PST) 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 ams.source.kernel.org (Postfix) with ESMTPS id 04E9AB82303 for ; Fri, 10 Mar 2023 15:17:18 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 33DF2C433AE; Fri, 10 Mar 2023 15:17:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1678461436; bh=bzSE2fHWqQ9xa+lQ2vobCCfKDGcMvRNkTC4iTAwRmKg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=FZ0+6MpkYsETnDXtrkHwfwDOwLppcJZeZT7/+UREq07/ax09d+PWg/drkM2Wy1bXd PAc1NP9Ca5iNnH1lhqnzZmQM/9gwT+FYAsG2Z+IYftzkTx7BIr+mFfcCR9Qva4OiX5 Zo9nDajAKUxlhFiyyNYkjdb10do52A0Y7Ihjoe2M= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Lyude Paul , Imre Deak Subject: [PATCH 5.15 127/136] drm/display/dp_mst: Fix down message handling after a packet reception error Date: Fri, 10 Mar 2023 14:44:09 +0100 Message-Id: <20230310133711.066072149@linuxfoundation.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230310133706.811226272@linuxfoundation.org> References: <20230310133706.811226272@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Imre Deak commit 1241aedb6b5c7a5a8ad73e5eb3a41cfe18a3e00e upstream. After an error during receiving a packet for a multi-packet DP MST sideband message, the state tracking which packets have been received already is not reset. This prevents the reception of subsequent down messages (due to the pending message not yet completed with an end-of-message-transfer packet). Fix the above by resetting the reception state after a packet error. Cc: Lyude Paul Cc: # v3.17+ Signed-off-by: Imre Deak Reviewed-by: Lyude Paul Link: https://patchwork.freedesktop.org/patch/msgid/20221214184258.2869417-2-imre.deak@intel.com Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/drm_dp_mst_topology.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/gpu/drm/drm_dp_mst_topology.c +++ b/drivers/gpu/drm/drm_dp_mst_topology.c @@ -3997,7 +3997,7 @@ static int drm_dp_mst_handle_down_rep(st struct drm_dp_sideband_msg_rx *msg = &mgr->down_rep_recv; if (!drm_dp_get_one_sb_msg(mgr, false, &mstb)) - goto out; + goto out_clear_reply; /* Multi-packet message transmission, don't clear the reply */ if (!msg->have_eomt)