From patchwork Mon Dec 18 15:32:17 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Can Guo X-Patchwork-Id: 13497173 Received: from mx0a-0031df01.pphosted.com (mx0a-0031df01.pphosted.com [205.220.168.131]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 75D293D54D; Mon, 18 Dec 2023 15:34:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=quicinc.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=qualcomm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=quicinc.com header.i=@quicinc.com header.b="iQ24PMGu" Received: from pps.filterd (m0279863.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.24/8.17.1.24) with ESMTP id 3BIAsWg9018798; Mon, 18 Dec 2023 15:33:53 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; h= from:to:cc:subject:date:message-id; s=qcppdkim1; bh=Ow5SPTTNB88V cAirt4L0hAseb2z31VaLkP7mDGOMQDA=; b=iQ24PMGu8XqJCIvZjt2R/W/gBFtI wsvbFvOzqZvsRYEaqykLSNPv17pH72X1hRHJjbv2zAIvMwtNHqMc0TWcbjBJZzix 4AiFwvbfRC9Mc8tpVsTJCcpMD1pDLXbfay7hUK3uKCiBY5AX/y0FVc6SGtQ2aiYz pd0qtHJmfvc27Uwz5ZVh1/w3m2ZpQIEMs0LXlXU99SLonXxlVufA8bbTS9K/dqOP xaWP/BsVWRKYsQYkz928wfO9ftfNOg8jsv+b37tPMiFyYlH9z6CaQ5LMWvYOC7EV BG9Ufw+PhTMarXdqfy5lJQ3DEMJ9Gv3uqH2hkKQT0Gqhqvj+e8vQRCWrUQ== Received: from nasanppmta04.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3v2mfe0n99-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 18 Dec 2023 15:33:53 +0000 (GMT) Received: from pps.filterd (NASANPPMTA04.qualcomm.com [127.0.0.1]) by NASANPPMTA04.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTP id 3BIFWXT3029489; Mon, 18 Dec 2023 15:33:52 GMT Received: from pps.reinject (localhost [127.0.0.1]) by NASANPPMTA04.qualcomm.com (PPS) with ESMTP id 3v14ykw605-1; Mon, 18 Dec 2023 15:33:52 +0000 Received: from NASANPPMTA04.qualcomm.com (NASANPPMTA04.qualcomm.com [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 3BIFXqos031583; Mon, 18 Dec 2023 15:33:52 GMT Received: from stor-dylan.qualcomm.com (stor-dylan.qualcomm.com [192.168.140.207]) by NASANPPMTA04.qualcomm.com (PPS) with ESMTP id 3BIFXpFx031579; Mon, 18 Dec 2023 15:33:52 +0000 Received: by stor-dylan.qualcomm.com (Postfix, from userid 359480) id AE92E20A6B; Mon, 18 Dec 2023 07:33:51 -0800 (PST) From: Can Guo To: quic_cang@quicinc.com, bvanassche@acm.org, mani@kernel.org, adrian.hunter@intel.com, beanhuo@micron.com, avri.altman@wdc.com, junwoo80.lee@samsung.com, martin.petersen@oracle.com Cc: linux-scsi@vger.kernel.org, linux-arm-msm@vger.kernel.org, Alim Akhtar , "James E.J. Bottomley" , Stanley Chu , Asutosh Das , Peter Wang , "Bao D. Nguyen" , Arthur Simchaev , linux-kernel@vger.kernel.org (open list) Subject: [PATCH] scsi: ufs: core: Let the sq_lock protect sq_tail_slot access Date: Mon, 18 Dec 2023 07:32:17 -0800 Message-Id: <1702913550-20631-1-git-send-email-quic_cang@quicinc.com> X-Mailer: git-send-email 2.7.4 X-QCInternal: smtphost X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-ORIG-GUID: 2x7iaMGGHfK-tl-wx8Yqxco24rlFPNO4 X-Proofpoint-GUID: 2x7iaMGGHfK-tl-wx8Yqxco24rlFPNO4 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.997,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-12-09_01,2023-12-07_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 clxscore=1011 suspectscore=0 malwarescore=0 lowpriorityscore=0 mlxscore=0 mlxlogscore=999 phishscore=0 adultscore=0 impostorscore=0 spamscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2311290000 definitions=main-2312180114 Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: If access sq_tail_slot without the protection from the sq_lock, race condition can have multiple SQEs copied to duplicate SQE slot(s), which can lead to multiple incredible stability issues. Fix it by moving the *dest initialization, in ufshcd_send_command(), back under protection from the sq_lock. Fixes: 3c85f087faec ("scsi: ufs: mcq: Use pointer arithmetic in ufshcd_send_command()") Signed-off-by: Can Guo Reviewed-by: Bart Van Assche Reviewed-by: Manivannan Sadhasivam diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c index ae9936f..2994aac 100644 --- a/drivers/ufs/core/ufshcd.c +++ b/drivers/ufs/core/ufshcd.c @@ -2274,9 +2274,10 @@ void ufshcd_send_command(struct ufs_hba *hba, unsigned int task_tag, if (is_mcq_enabled(hba)) { int utrd_size = sizeof(struct utp_transfer_req_desc); struct utp_transfer_req_desc *src = lrbp->utr_descriptor_ptr; - struct utp_transfer_req_desc *dest = hwq->sqe_base_addr + hwq->sq_tail_slot; + struct utp_transfer_req_desc *dest; spin_lock(&hwq->sq_lock); + dest = hwq->sqe_base_addr + hwq->sq_tail_slot; memcpy(dest, src, utrd_size); ufshcd_inc_sq_tail(hwq); spin_unlock(&hwq->sq_lock);