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=-2.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 6A78CC6778A for ; Thu, 5 Jul 2018 18:41:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 311952403C for ; Thu, 5 Jul 2018 18:41:04 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 311952403C Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.vnet.ibm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754331AbeGESlA (ORCPT ); Thu, 5 Jul 2018 14:41:00 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:34760 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1754205AbeGESkw (ORCPT ); Thu, 5 Jul 2018 14:40:52 -0400 Received: from pps.filterd (m0098419.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.22/8.16.0.22) with SMTP id w65IYPoT122042 for ; Thu, 5 Jul 2018 14:40:52 -0400 Received: from e36.co.us.ibm.com (e36.co.us.ibm.com [32.97.110.154]) by mx0b-001b2d01.pphosted.com with ESMTP id 2k1p22y0ff-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Thu, 05 Jul 2018 14:40:51 -0400 Received: from localhost by e36.co.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Thu, 5 Jul 2018 12:40:47 -0600 Received: from b03ledav002.gho.boulder.ibm.com (b03ledav002.gho.boulder.ibm.com [9.17.130.233]) by b03cxnp08028.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id w65IekJ364159808 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Thu, 5 Jul 2018 11:40:46 -0700 Received: from b03ledav002.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 68889136059; Thu, 5 Jul 2018 12:40:46 -0600 (MDT) Received: from b03ledav002.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 9D3FA136053; Thu, 5 Jul 2018 12:40:45 -0600 (MDT) Received: from talon7.ibm.com (unknown [9.41.102.69]) by b03ledav002.gho.boulder.ibm.com (Postfix) with ESMTP; Thu, 5 Jul 2018 12:40:45 -0600 (MDT) From: Eddie James To: linux-i2c@vger.kernel.org Cc: linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, wsa@the-dreams.de, robh+dt@kernel.org, benh@kernel.crashing.org, joel@jms.id.au, mark.rutland@arm.com, gregkh@linuxfoundation.org, rdunlap@infradead.org, andy.shevchenko@gmail.com, peda@axentia.se, Eddie James Subject: [PATCH v11 6/8] i2c: fsi: Add I2C master locking Date: Thu, 5 Jul 2018 13:40:28 -0500 X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1530816030-13010-1-git-send-email-eajames@linux.vnet.ibm.com> References: <1530816030-13010-1-git-send-email-eajames@linux.vnet.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 18070518-0020-0000-0000-00000E3A3796 X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00009314; HX=3.00000241; KW=3.00000007; PH=3.00000004; SC=3.00000266; SDB=6.01057019; UDB=6.00542279; IPR=6.00834939; MB=3.00022012; MTD=3.00000008; XFM=3.00000015; UTC=2018-07-05 18:40:51 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18070518-0021-0000-0000-0000622DBD7E Message-Id: <1530816030-13010-7-git-send-email-eajames@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2018-07-05_07:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=1 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1806210000 definitions=main-1807050207 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Since there are many ports per master, each with it's own adapter and chardev, we need some locking to prevent transfers from changing the master state while other transfers are in progress. Signed-off-by: Eddie James Reviewed-by: Andy Shevchenko --- drivers/i2c/busses/i2c-fsi.c | 16 ++++++++++++---- 1 file changed, 12 insertions(+), 4 deletions(-) diff --git a/drivers/i2c/busses/i2c-fsi.c b/drivers/i2c/busses/i2c-fsi.c index 6cb4602..5520251 100644 --- a/drivers/i2c/busses/i2c-fsi.c +++ b/drivers/i2c/busses/i2c-fsi.c @@ -21,6 +21,7 @@ #include #include #include +#include #include #include @@ -148,6 +149,7 @@ struct fsi_i2c_master { struct fsi_device *fsi; u8 fifo_size; struct list_head ports; + struct mutex lock; }; struct fsi_i2c_port { @@ -486,11 +488,14 @@ static int fsi_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int i, rc; unsigned long start_time; struct fsi_i2c_port *port = adap->algo_data; + struct fsi_i2c_master *master = port->master; struct i2c_msg *msg; + mutex_lock(&master->lock); + rc = fsi_i2c_set_port(port); if (rc) - return rc; + goto unlock; for (i = 0; i < num; i++) { msg = msgs + i; @@ -498,15 +503,17 @@ static int fsi_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, rc = fsi_i2c_start(port, msg, i == num - 1); if (rc) - return rc; + goto unlock; rc = fsi_i2c_wait(port, msg, adap->timeout - (jiffies - start_time)); if (rc) - return rc; + goto unlock; } - return num; +unlock: + mutex_unlock(&master->lock); + return rc ? : num; } static u32 fsi_i2c_functionality(struct i2c_adapter *adap) @@ -533,6 +540,7 @@ static int fsi_i2c_probe(struct device *dev) if (!i2c) return -ENOMEM; + mutex_init(&i2c->lock); i2c->fsi = to_fsi_dev(dev); INIT_LIST_HEAD(&i2c->ports); -- 1.8.3.1