From patchwork Wed Feb 22 10:56:37 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vivek Pernamitta X-Patchwork-Id: 13149023 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 12AC3C6379F for ; Wed, 22 Feb 2023 10:57:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230267AbjBVK51 (ORCPT ); Wed, 22 Feb 2023 05:57:27 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52580 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229749AbjBVK50 (ORCPT ); Wed, 22 Feb 2023 05:57:26 -0500 Received: from mx0a-0031df01.pphosted.com (mx0a-0031df01.pphosted.com [205.220.168.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DA73C37B69; Wed, 22 Feb 2023 02:57:25 -0800 (PST) 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 31M5VX83002660; Wed, 22 Feb 2023 10:56:46 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=ixm7GUkIHDJi7rAFz5vFQQS/srNr3SbjM/9REZ1D7bk=; b=kpriDmJVSj7iuxKbb6evpDUEP69K3LdSjO77BCBh9CCPyUKOK03FICN7AQilth9NYoUu ShWFI8vBR4YK6BGhckaYmZqStRtCDrViCHA/HhvtTPTLb1uNlG/P+/FSWjYXikjaYiBQ DvgQlaOLh/6T3AWKwA1to80lGWgC+goFfsyVDhW7qdK60QogaB0KNnVdeDwUpBqK2rWt 4EBXOTgn3Mq7qE9ycPGK7Gy90+L/GakoDGB2gmTgtFkxcFMmuYAMkAyjuuTjSnfZ+13V NSf5FkaBXjAxs2J1KALdtYKU1pCmZO9Tg6SzgVl81kTO6aVnNm9yUHrWQskaQkC/mIXd Hw== Received: from apblrppmta02.qualcomm.com (blr-bdr-fw-01_GlobalNAT_AllZones-Outside.qualcomm.com [103.229.18.19]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3nvp4v3x80-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 22 Feb 2023 10:56:46 +0000 Received: from pps.filterd (APBLRPPMTA02.qualcomm.com [127.0.0.1]) by APBLRPPMTA02.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTP id 31MAuglB005888; Wed, 22 Feb 2023 10:56:42 GMT Received: from pps.reinject (localhost [127.0.0.1]) by APBLRPPMTA02.qualcomm.com (PPS) with ESMTP id 3ntqrkw5xf-1; Wed, 22 Feb 2023 10:56:42 +0000 Received: from APBLRPPMTA02.qualcomm.com (APBLRPPMTA02.qualcomm.com [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 31MAugxw005883; Wed, 22 Feb 2023 10:56:42 GMT Received: from hu-sgudaval-hyd.qualcomm.com (hu-vpernami-hyd.qualcomm.com [10.213.107.240]) by APBLRPPMTA02.qualcomm.com (PPS) with ESMTP id 31MAufmZ005882; Wed, 22 Feb 2023 10:56:42 +0000 Received: by hu-sgudaval-hyd.qualcomm.com (Postfix, from userid 2370923) id 0152C157C; Wed, 22 Feb 2023 16:26:40 +0530 (+0530) From: Vivek Pernamitta To: mhi@lists.linux.dev Cc: quic_qianyu@quicinc.com, manivannan.sadhasivam@linaro.org, quic_vbadigan@quicinc.com, quic_krichai@quicinc.com, quic_skananth@quicinc.com, Vivek Pernamitta , Manivannan Sadhasivam , Alex Elder , Greg Kroah-Hartman , Hemant Kumar , Jeffrey Hugo , Paul Davey , Bhaumik Bhatt , linux-arm-msm@vger.kernel.org (open list:MHI BUS), linux-kernel@vger.kernel.org (open list) Subject: [PATCH V2] bus: mhi: host: Avoid ringing EV DB if there is no elements to process Date: Wed, 22 Feb 2023 16:26:37 +0530 Message-Id: <1677063399-27595-1-git-send-email-quic_vpernami@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: oGZ9hRZXI8cJiIotRFakAbh8jA2pmzGc X-Proofpoint-GUID: oGZ9hRZXI8cJiIotRFakAbh8jA2pmzGc X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.219,Aquarius:18.0.930,Hydra:6.0.562,FMLib:17.11.170.22 definitions=2023-02-22_05,2023-02-22_01,2023-02-09_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 mlxlogscore=518 clxscore=1015 adultscore=0 spamscore=0 phishscore=0 suspectscore=0 bulkscore=0 impostorscore=0 lowpriorityscore=0 malwarescore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2212070000 definitions=main-2302220096 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Avoid ringing Event DB if there is no elements to process. As mhi_poll function can be called by mhi client drivers which will call process_event, which will ring DB even if there no ring elements to process. Signed-off-by: Vivek Pernamitta --- drivers/bus/mhi/host/main.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/bus/mhi/host/main.c b/drivers/bus/mhi/host/main.c index df0fbfe..0311a31 100644 --- a/drivers/bus/mhi/host/main.c +++ b/drivers/bus/mhi/host/main.c @@ -961,7 +961,7 @@ int mhi_process_ctrl_ev_ring(struct mhi_controller *mhi_cntrl, } read_lock_bh(&mhi_cntrl->pm_lock); - if (likely(MHI_DB_ACCESS_VALID(mhi_cntrl))) + if (likely(MHI_DB_ACCESS_VALID(mhi_cntrl)) && count) mhi_ring_er_db(mhi_event); read_unlock_bh(&mhi_cntrl->pm_lock); @@ -1031,7 +1031,9 @@ int mhi_process_data_event_ring(struct mhi_controller *mhi_cntrl, count++; } read_lock_bh(&mhi_cntrl->pm_lock); - if (likely(MHI_DB_ACCESS_VALID(mhi_cntrl))) + + /* Ring EV DB only if there is any pending element to process */ + if (likely(MHI_DB_ACCESS_VALID(mhi_cntrl)) && count) mhi_ring_er_db(mhi_event); read_unlock_bh(&mhi_cntrl->pm_lock);