From patchwork Wed Aug 26 12:06:09 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexandru Ardelean X-Patchwork-Id: 11738155 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 16EDC13A4 for ; Wed, 26 Aug 2020 12:06:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0971820838 for ; Wed, 26 Aug 2020 12:06:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729425AbgHZMGY (ORCPT ); Wed, 26 Aug 2020 08:06:24 -0400 Received: from mx0a-00128a01.pphosted.com ([148.163.135.77]:55440 "EHLO mx0a-00128a01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729519AbgHZMGX (ORCPT ); Wed, 26 Aug 2020 08:06:23 -0400 Received: from pps.filterd (m0167088.ppops.net [127.0.0.1]) by mx0a-00128a01.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 07QC4Kvp019378; Wed, 26 Aug 2020 08:06:17 -0400 Received: from nwd2mta4.analog.com ([137.71.173.58]) by mx0a-00128a01.pphosted.com with ESMTP id 332w765g4u-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 26 Aug 2020 08:06:17 -0400 Received: from ASHBMBX8.ad.analog.com (ashbmbx8.ad.analog.com [10.64.17.5]) by nwd2mta4.analog.com (8.14.7/8.14.7) with ESMTP id 07QC6Gfb002516 (version=TLSv1/SSLv3 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=FAIL); Wed, 26 Aug 2020 08:06:16 -0400 Received: from ASHBCASHYB5.ad.analog.com (10.64.17.133) by ASHBMBX8.ad.analog.com (10.64.17.5) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1779.2; Wed, 26 Aug 2020 08:06:15 -0400 Received: from ASHBMBX8.ad.analog.com (10.64.17.5) by ASHBCASHYB5.ad.analog.com (10.64.17.133) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1779.2; Wed, 26 Aug 2020 08:06:15 -0400 Received: from zeus.spd.analog.com (10.66.68.11) by ASHBMBX8.ad.analog.com (10.64.17.5) with Microsoft SMTP Server id 15.1.1779.2 via Frontend Transport; Wed, 26 Aug 2020 08:06:14 -0400 Received: from saturn.ad.analog.com ([10.48.65.100]) by zeus.spd.analog.com (8.15.1/8.15.1) with ESMTP id 07QC6ASE000563; Wed, 26 Aug 2020 08:06:11 -0400 From: Alexandru Ardelean To: , CC: , , , Sergiu Cuciurean , Alexandru Ardelean Subject: [PATCH] iio: adc: fsl-imx25-gcq: Replace indio_dev->mlock with own device lock Date: Wed, 26 Aug 2020 15:06:09 +0300 Message-ID: <20200826120609.203724-1-alexandru.ardelean@analog.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-ADIRoutedOnPrem: True X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235,18.0.687 definitions=2020-08-26_08:2020-08-26,2020-08-26 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 mlxlogscore=612 spamscore=0 lowpriorityscore=0 phishscore=0 mlxscore=0 malwarescore=0 priorityscore=1501 bulkscore=0 clxscore=1011 impostorscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2008260098 Sender: linux-iio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org From: Sergiu Cuciurean As part of the general cleanup of indio_dev->mlock, this change replaces it with a local lock, to protect against any other accesses during the reading of sample. Reading a sample requires multiple consecutive regmap operations and a completion callback, so this requires that no other read occurs until it completes. Signed-off-by: Sergiu Cuciurean Signed-off-by: Alexandru Ardelean --- drivers/iio/adc/fsl-imx25-gcq.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/iio/adc/fsl-imx25-gcq.c b/drivers/iio/adc/fsl-imx25-gcq.c index 8cb51cf7a816..2a56ed0fc793 100644 --- a/drivers/iio/adc/fsl-imx25-gcq.c +++ b/drivers/iio/adc/fsl-imx25-gcq.c @@ -38,6 +38,7 @@ struct mx25_gcq_priv { struct completion completed; struct clk *clk; int irq; + struct mutex lock; struct regulator *vref[4]; u32 channel_vref_mv[MX25_NUM_CFGS]; }; @@ -137,9 +138,9 @@ static int mx25_gcq_read_raw(struct iio_dev *indio_dev, switch (mask) { case IIO_CHAN_INFO_RAW: - mutex_lock(&indio_dev->mlock); + mutex_lock(&priv->lock); ret = mx25_gcq_get_raw_value(&indio_dev->dev, chan, priv, val); - mutex_unlock(&indio_dev->mlock); + mutex_unlock(&priv->lock); return ret; case IIO_CHAN_INFO_SCALE: @@ -314,6 +315,8 @@ static int mx25_gcq_probe(struct platform_device *pdev) return PTR_ERR(priv->regs); } + mutex_init(&priv->lock); + init_completion(&priv->completed); ret = mx25_gcq_setup_cfgs(pdev, priv);