From patchwork Wed Aug 26 13:22:03 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexandru Ardelean X-Patchwork-Id: 11738389 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 2C519913 for ; Wed, 26 Aug 2020 13:22:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 19379208E4 for ; Wed, 26 Aug 2020 13:22:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730129AbgHZNWR (ORCPT ); Wed, 26 Aug 2020 09:22:17 -0400 Received: from mx0a-00128a01.pphosted.com ([148.163.135.77]:52906 "EHLO mx0a-00128a01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728276AbgHZNWR (ORCPT ); Wed, 26 Aug 2020 09:22:17 -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 07QDKK90016639; Wed, 26 Aug 2020 09:22:16 -0400 Received: from nwd2mta4.analog.com ([137.71.173.58]) by mx0a-00128a01.pphosted.com with ESMTP id 332w765qt0-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 26 Aug 2020 09:22:16 -0400 Received: from SCSQMBX11.ad.analog.com (scsqmbx11.ad.analog.com [10.77.17.10]) by nwd2mta4.analog.com (8.14.7/8.14.7) with ESMTP id 07QDMEDk019387 (version=TLSv1/SSLv3 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=FAIL); Wed, 26 Aug 2020 09:22:14 -0400 Received: from SCSQCASHYB6.ad.analog.com (10.77.17.132) by SCSQMBX11.ad.analog.com (10.77.17.10) 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 06:22:13 -0700 Received: from SCSQMBX11.ad.analog.com (10.77.17.10) by SCSQCASHYB6.ad.analog.com (10.77.17.132) 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 06:21:45 -0700 Received: from zeus.spd.analog.com (10.66.68.11) by SCSQMBX11.ad.analog.com (10.77.17.10) with Microsoft SMTP Server id 15.1.1779.2 via Frontend Transport; Wed, 26 Aug 2020 06:22:12 -0700 Received: from saturn.ad.analog.com ([10.48.65.100]) by zeus.spd.analog.com (8.15.1/8.15.1) with ESMTP id 07QDM8tD003222; Wed, 26 Aug 2020 09:22:09 -0400 From: Alexandru Ardelean To: , CC: , , , "Sergiu Cuciurean" , Alexandru Ardelean Subject: [PATCH] iio: adc: exynos_adc: Replace indio_dev->mlock with own device lock Date: Wed, 26 Aug 2020 16:22:03 +0300 Message-ID: <20200826132203.236748-1-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_09:2020-08-26,2020-08-26 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 mlxlogscore=927 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-2008260105 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 potential concurrent access to the completion callback during a conversion. Signed-off-by: Sergiu Cuciurean Signed-off-by: Alexandru Ardelean Reviewed-by: Krzysztof Kozlowski --- drivers/iio/adc/exynos_adc.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) diff --git a/drivers/iio/adc/exynos_adc.c b/drivers/iio/adc/exynos_adc.c index 7d23b6c33284..6a49f8dfab22 100644 --- a/drivers/iio/adc/exynos_adc.c +++ b/drivers/iio/adc/exynos_adc.c @@ -132,6 +132,8 @@ struct exynos_adc { struct completion completion; + struct mutex lock; + u32 value; unsigned int version; @@ -542,7 +544,7 @@ static int exynos_read_raw(struct iio_dev *indio_dev, return -EINVAL; } - mutex_lock(&indio_dev->mlock); + mutex_lock(&info->lock); reinit_completion(&info->completion); /* Select the channel to be used and Trigger conversion */ @@ -562,7 +564,7 @@ static int exynos_read_raw(struct iio_dev *indio_dev, ret = IIO_VAL_INT; } - mutex_unlock(&indio_dev->mlock); + mutex_unlock(&info->lock); return ret; } @@ -573,7 +575,7 @@ static int exynos_read_s3c64xx_ts(struct iio_dev *indio_dev, int *x, int *y) unsigned long timeout; int ret; - mutex_lock(&indio_dev->mlock); + mutex_lock(&info->lock); info->read_ts = true; reinit_completion(&info->completion); @@ -598,7 +600,7 @@ static int exynos_read_s3c64xx_ts(struct iio_dev *indio_dev, int *x, int *y) } info->read_ts = false; - mutex_unlock(&indio_dev->mlock); + mutex_unlock(&info->lock); return ret; } @@ -872,6 +874,8 @@ static int exynos_adc_probe(struct platform_device *pdev) indio_dev->channels = exynos_adc_iio_channels; indio_dev->num_channels = info->data->num_channels; + mutex_init(&info->lock); + ret = request_irq(info->irq, exynos_adc_isr, 0, dev_name(&pdev->dev), info); if (ret < 0) {