From patchwork Thu Aug 3 07:16:59 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wen Gong X-Patchwork-Id: 13339342 X-Patchwork-Delegate: kvalo@adurom.com 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 BFCF1C001DF for ; Thu, 3 Aug 2023 07:17:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233397AbjHCHRa (ORCPT ); Thu, 3 Aug 2023 03:17:30 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37116 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229668AbjHCHR3 (ORCPT ); Thu, 3 Aug 2023 03:17:29 -0400 Received: from mx0a-0031df01.pphosted.com (mx0a-0031df01.pphosted.com [205.220.168.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7ABA1FF for ; Thu, 3 Aug 2023 00:17:28 -0700 (PDT) Received: from pps.filterd (m0279862.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 3736ss7A005034; Thu, 3 Aug 2023 07:17:23 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding : content-type; s=qcppdkim1; bh=l+suyGsoe41ErzmRfO+VlfYJ9OlO3qrQAsgpsbKpqkI=; b=iORqZJa7SY3+GeKFXgiv3EMjoIdzUHek0kYJCcxkmfDWLn70eig4ISRWzoLNph4CMFT2 Uu8KAzgJhatuhMWnkZzC9iNFJk1Q9AQcjIacHjdh2RJHAQZ6x8nPLMpoyLvj95p2YN+/ N+Rl3gWiBy4tzqOFjdvMXxa7STB1+EfAp9dTHqOo6IzS+jZgSveSxNICmwBAS5M82WZ5 odxevkgXyeCsIce2v5b45xSW8NYlxDNekhIBPxyeWIt02FBDu8PQgUQUVtWKITffCJGT oqT4/OGtKFAnF6lwfZ0S5SfMbiwME4+Rd57vOwS2ffBfxeXsnjYJyFCyFCLzGtI6uA4+ gA== Received: from nalasppmta02.qualcomm.com (Global_NAT1.qualcomm.com [129.46.96.20]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3s7sgnhheb-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 03 Aug 2023 07:17:22 +0000 Received: from nalasex01a.na.qualcomm.com (nalasex01a.na.qualcomm.com [10.47.209.196]) by NALASPPMTA02.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTPS id 3737HLmw017328 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 3 Aug 2023 07:17:21 GMT Received: from wgong-HP3-Z230-SFF-Workstation.qca.qualcomm.com (10.80.80.8) by nalasex01a.na.qualcomm.com (10.47.209.196) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.30; Thu, 3 Aug 2023 00:17:20 -0700 From: Wen Gong To: CC: , Baochen Qiang , Wen Gong Subject: [PATCH v5 3/5] wifi: ath11k: fix a possible dead lock caused by ab->base_lock Date: Thu, 3 Aug 2023 03:16:59 -0400 Message-ID: <20230803071701.15084-4-quic_wgong@quicinc.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230803071701.15084-1-quic_wgong@quicinc.com> References: <20230803071701.15084-1-quic_wgong@quicinc.com> MIME-Version: 1.0 X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01b.na.qualcomm.com (10.46.141.250) To nalasex01a.na.qualcomm.com (10.47.209.196) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-ORIG-GUID: Respg-N276ZfthKsMqNgT7PR4H01btz4 X-Proofpoint-GUID: Respg-N276ZfthKsMqNgT7PR4H01btz4 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.957,Hydra:6.0.591,FMLib:17.11.176.26 definitions=2023-08-03_05,2023-08-01_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 malwarescore=0 lowpriorityscore=0 spamscore=0 mlxscore=0 mlxlogscore=973 priorityscore=1501 impostorscore=0 adultscore=0 bulkscore=0 phishscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2306200000 definitions=main-2308030064 Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org From: Baochen Qiang spin_lock/spin_unlock are used in ath11k_reg_chan_list_event to acquire/release ab->base_lock, for now this is safe because that function is only called in soft IRQ context. But ath11k_reg_chan_list_event() will be called from process context in an upcoming patch, and this can result in a deadlock if ab->base_lock is acquired in process context and then soft IRQ occurs on the same CPU and tries to acquire that lock. Fix it by using spin_lock_bh and spin_unlock_bh instead. Tested-on: WCN6855 hw2.0 PCI WLAN.HSP.1.1-03125-QCAHSPSWPL_V1_V2_SILICONZ_LITE-3.6510.23 Fixes: 69a0fcf8a9f2 ("ath11k: Avoid reg rules update during firmware recovery") Signed-off-by: Baochen Qiang Signed-off-by: Wen Gong --- drivers/net/wireless/ath/ath11k/wmi.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/drivers/net/wireless/ath/ath11k/wmi.c b/drivers/net/wireless/ath/ath11k/wmi.c index 1fb445106872..c427299b7202 100644 --- a/drivers/net/wireless/ath/ath11k/wmi.c +++ b/drivers/net/wireless/ath/ath11k/wmi.c @@ -7138,13 +7138,13 @@ int ath11k_reg_handle_chan_list(struct ath11k_base *ab, /* Avoid default reg rule updates sent during FW recovery if * it is already available */ - spin_lock(&ab->base_lock); + spin_lock_bh(&ab->base_lock); if (test_bit(ATH11K_FLAG_RECOVERY, &ab->dev_flags) && ab->default_regd[pdev_idx]) { - spin_unlock(&ab->base_lock); + spin_unlock_bh(&ab->base_lock); goto retfail; } - spin_unlock(&ab->base_lock); + spin_unlock_bh(&ab->base_lock); if (pdev_idx >= ab->num_radios) { /* Process the event for phy0 only if single_pdev_only @@ -7194,7 +7194,7 @@ int ath11k_reg_handle_chan_list(struct ath11k_base *ab, ab->reg_info_store[pdev_idx] = *reg_info; } - spin_lock(&ab->base_lock); + spin_lock_bh(&ab->base_lock); if (ab->default_regd[pdev_idx]) { /* The initial rules from FW after WMI Init is to build * the default regd. From then on, any rules updated for @@ -7214,7 +7214,7 @@ int ath11k_reg_handle_chan_list(struct ath11k_base *ab, ab->default_regd[pdev_idx] = regd; } ab->dfs_region = reg_info->dfs_region; - spin_unlock(&ab->base_lock); + spin_unlock_bh(&ab->base_lock); return 0;