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=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, 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 4AB08C11F83 for ; Mon, 12 Jul 2021 08:34:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2844861186 for ; Mon, 12 Jul 2021 08:34:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1377690AbhGLIgQ (ORCPT ); Mon, 12 Jul 2021 04:36:16 -0400 Received: from mail.kernel.org ([198.145.29.99]:36488 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1350358AbhGLHu5 (ORCPT ); Mon, 12 Jul 2021 03:50:57 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 868876161F; Mon, 12 Jul 2021 07:44:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1626075897; bh=fNfMGwQJKU7xCENjJix6Hk1CGW1bNKsCjIkjIHa08ig=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=LVxSh21cW5hLW7eouw51Gk48LkHpaom+X5Lu0WeXWM7hAEYEZSk9hO5h0HDPP6SaW hlacvgug1AJ5UgY42OAUVbFKUB5MGwB20oRKtRCYIseq+N7optUfOorsv3XPGivMx5 hZSKOMcMtk02IP/0Cq7VsQ7H0UQVf1G0SNwpONTw= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Lang Yu , Roman Li , Qingqing Zhuo , Wayne Lin , Daniel Wheeler , Alex Deucher , Sasha Levin Subject: [PATCH 5.13 410/800] drm/amd/display: fix potential gpu reset deadlock Date: Mon, 12 Jul 2021 08:07:13 +0200 Message-Id: <20210712061010.780988832@linuxfoundation.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210712060912.995381202@linuxfoundation.org> References: <20210712060912.995381202@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Roman Li [ Upstream commit cf8b92a75646735136053ce51107bfa8cfc23191 ] [Why] In gpu reset dc_lock acquired in dm_suspend(). Asynchronously handle_hpd_rx_irq can also be called through amdgpu_dm_irq_suspend->flush_work, which also tries to acquire dc_lock. That causes a deadlock. [How] Check if amdgpu executing reset before acquiring dc_lock. Signed-off-by: Lang Yu Signed-off-by: Roman Li Reviewed-by: Qingqing Zhuo Acked-by: Wayne Lin Tested-by: Daniel Wheeler Signed-off-by: Alex Deucher Signed-off-by: Sasha Levin --- drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c index 652cc1a0e450..875fd187463e 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -2726,13 +2726,15 @@ static void handle_hpd_rx_irq(void *param) } } - mutex_lock(&adev->dm.dc_lock); + if (!amdgpu_in_reset(adev)) + mutex_lock(&adev->dm.dc_lock); #ifdef CONFIG_DRM_AMD_DC_HDCP result = dc_link_handle_hpd_rx_irq(dc_link, &hpd_irq_data, NULL); #else result = dc_link_handle_hpd_rx_irq(dc_link, NULL, NULL); #endif - mutex_unlock(&adev->dm.dc_lock); + if (!amdgpu_in_reset(adev)) + mutex_unlock(&adev->dm.dc_lock); out: if (result && !is_mst_root_connector) { -- 2.30.2