From patchwork Wed Sep 13 08:47:41 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Qiang Yu X-Patchwork-Id: 13382605 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 CA0E0CA550A for ; Wed, 13 Sep 2023 08:48:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239095AbjIMIsI (ORCPT ); Wed, 13 Sep 2023 04:48:08 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56202 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239096AbjIMIsH (ORCPT ); Wed, 13 Sep 2023 04:48:07 -0400 Received: from mx0b-0031df01.pphosted.com (mx0b-0031df01.pphosted.com [205.220.180.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 67950199E; Wed, 13 Sep 2023 01:48:00 -0700 (PDT) Received: from pps.filterd (m0279869.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 38D8amli025056; Wed, 13 Sep 2023 08:47:48 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; s=qcppdkim1; bh=xusWZUomRiXPwqA1MTyigAKtR02LdB8vIjAksisn+So=; b=VbXvxtY3+HuJ3X4WWFFqsbNMyF1NeIrdoKN/Z+uJW4mUq8lG5/eq2Ddd7ZwwtVvnT14i EnTZKteI4izgvjyQaeoqupOFbmbUNqIRfF95K5cQBaLQLcOYM75lxw9ByUYN6ZwIKsHH dtAaKd2elk+XNiXQ9vxYaoadgn5R9fUz4686yVxluNRYQkjdS6ApfcoEUjT6djyXS1tr R16v/WhlUdEPLCqZ9qf3HmcreiVzE/tGVcYjpgbSwXNdqGgjOuMDdIVp+JrAwN5Cks+0 EBAugOAH61EVImeOWqZhhQcX/EJ55kaSoIFusVDPGR8vFJtJi+qjuRvsatPCP4PdRRF8 pA== Received: from aptaippmta02.qualcomm.com (tpe-colo-wan-fw-bordernet.qualcomm.com [103.229.16.4]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3t2yp3h2c1-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 13 Sep 2023 08:47:48 +0000 Received: from pps.filterd (APTAIPPMTA02.qualcomm.com [127.0.0.1]) by APTAIPPMTA02.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTP id 38D8lj2t017801; Wed, 13 Sep 2023 08:47:45 GMT Received: from pps.reinject (localhost [127.0.0.1]) by APTAIPPMTA02.qualcomm.com (PPS) with ESMTP id 3t0hskhgyy-1; Wed, 13 Sep 2023 08:47:45 +0000 Received: from APTAIPPMTA02.qualcomm.com (APTAIPPMTA02.qualcomm.com [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 38D8ljXY017793; Wed, 13 Sep 2023 08:47:45 GMT Received: from cbsp-sh-gv.qualcomm.com (CBSP-SH-gv.ap.qualcomm.com [10.231.249.68]) by APTAIPPMTA02.qualcomm.com (PPS) with ESMTP id 38D8ljLY017790; Wed, 13 Sep 2023 08:47:45 +0000 Received: by cbsp-sh-gv.qualcomm.com (Postfix, from userid 4098150) id 9B5684E07; Wed, 13 Sep 2023 16:47:44 +0800 (CST) From: Qiang Yu To: mani@kernel.org, quic_jhugo@quicinc.com Cc: mhi@lists.linux.dev, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, quic_cang@quicinc.com, quic_mrana@quicinc.com, Hemant Kumar , Lazarus Motha , Qiang Yu Subject: [PATCH v2 2/2] bus: mhi: host: Take irqsave lock after TRE is generated Date: Wed, 13 Sep 2023 16:47:41 +0800 Message-Id: <1694594861-12691-3-git-send-email-quic_qianyu@quicinc.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1694594861-12691-1-git-send-email-quic_qianyu@quicinc.com> References: <1694594861-12691-1-git-send-email-quic_qianyu@quicinc.com> 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-GUID: foD5ypGQJQOX_2_oxBjt4bU3xFXsoARr X-Proofpoint-ORIG-GUID: foD5ypGQJQOX_2_oxBjt4bU3xFXsoARr X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.267,Aquarius:18.0.980,Hydra:6.0.601,FMLib:17.11.176.26 definitions=2023-09-13_02,2023-09-05_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 priorityscore=1501 phishscore=0 mlxlogscore=689 spamscore=0 impostorscore=0 mlxscore=0 bulkscore=0 malwarescore=0 lowpriorityscore=0 suspectscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2308100000 definitions=main-2309130070 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org From: Hemant Kumar Take irqsave lock after TRE is generated to avoid deadlock due to core getting interrupts enabled as local_bh_enable must not be called with irqs disabled based on upstream patch. Signed-off-by: Hemant Kumar Signed-off-by: Lazarus Motha Signed-off-by: Qiang Yu --- drivers/bus/mhi/host/main.c | 13 +++++-------- 1 file changed, 5 insertions(+), 8 deletions(-) diff --git a/drivers/bus/mhi/host/main.c b/drivers/bus/mhi/host/main.c index 13c4b89..8accdfd 100644 --- a/drivers/bus/mhi/host/main.c +++ b/drivers/bus/mhi/host/main.c @@ -1124,17 +1124,15 @@ static int mhi_queue(struct mhi_device *mhi_dev, struct mhi_buf_info *buf_info, if (unlikely(MHI_PM_IN_ERROR_STATE(mhi_cntrl->pm_state))) return -EIO; - read_lock_irqsave(&mhi_cntrl->pm_lock, flags); - ret = mhi_is_ring_full(mhi_cntrl, tre_ring); - if (unlikely(ret)) { - ret = -EAGAIN; - goto exit_unlock; - } + if (unlikely(ret)) + return -EAGAIN; ret = mhi_gen_tre(mhi_cntrl, mhi_chan, buf_info, mflags); if (unlikely(ret)) - goto exit_unlock; + return ret; + + read_lock_irqsave(&mhi_cntrl->pm_lock, flags); /* Packet is queued, take a usage ref to exit M3 if necessary * for host->device buffer, balanced put is done on buffer completion @@ -1154,7 +1152,6 @@ static int mhi_queue(struct mhi_device *mhi_dev, struct mhi_buf_info *buf_info, if (dir == DMA_FROM_DEVICE) mhi_cntrl->runtime_put(mhi_cntrl); -exit_unlock: read_unlock_irqrestore(&mhi_cntrl->pm_lock, flags); return ret;