Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933475AbaLBXdI (ORCPT ); Tue, 2 Dec 2014 18:33:08 -0500 Received: from mail.sigma-star.at ([95.130.255.111]:14386 "EHLO mail.sigma-star.at" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933199AbaLBXdF (ORCPT ); Tue, 2 Dec 2014 18:33:05 -0500 From: Richard Weinberger To: jic23@kernel.org Cc: harald@ccbib.org, knaack.h@gmx.de, lars@metafoo.de, pmeerw@pmeerw.net, sanjeev_sharma@mentor.com, linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, Richard Weinberger Subject: [PATCH 1/4] iio: dht11: Add locking Date: Wed, 3 Dec 2014 00:32:53 +0100 Message-Id: <1417563176-31972-2-git-send-email-richard@nod.at> X-Mailer: git-send-email 1.8.4.5 In-Reply-To: <1417563176-31972-1-git-send-email-richard@nod.at> References: <1417563176-31972-1-git-send-email-richard@nod.at> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Make sure that the read function is not interrupted... Signed-off-by: Richard Weinberger --- drivers/iio/humidity/dht11.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/iio/humidity/dht11.c b/drivers/iio/humidity/dht11.c index d8771f5..168ebc4 100644 --- a/drivers/iio/humidity/dht11.c +++ b/drivers/iio/humidity/dht11.c @@ -29,6 +29,7 @@ #include #include #include +#include #include #include #include @@ -57,6 +58,7 @@ struct dht11 { int irq; struct completion completion; + struct mutex lock; s64 timestamp; int temperature; @@ -145,6 +147,7 @@ static int dht11_read_raw(struct iio_dev *iio_dev, struct dht11 *dht11 = iio_priv(iio_dev); int ret; + mutex_lock(&dht11->lock); if (dht11->timestamp + DHT11_DATA_VALID_TIME < iio_get_time_ns()) { reinit_completion(&dht11->completion); @@ -185,6 +188,7 @@ static int dht11_read_raw(struct iio_dev *iio_dev, ret = -EINVAL; err: dht11->num_edges = -1; + mutex_unlock(&dht11->lock); return ret; } @@ -268,6 +272,7 @@ static int dht11_probe(struct platform_device *pdev) platform_set_drvdata(pdev, iio); init_completion(&dht11->completion); + mutex_init(&dht11->lock); iio->name = pdev->name; iio->dev.parent = &pdev->dev; iio->info = &dht11_iio_info; -- 1.8.4.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/