From: Arushi Singhal <arushisinghal19971997@gmail.com>
To: lars@metafoo.de
Cc: Michael Hennerich <Michael.Hennerich@analog.com>,
Jonathan Cameron <jic23@kernel.org>,
Hartmut Knaack <knaack.h@gmx.de>,
Peter Meerwald-Stadler <pmeerw@pmeerw.net>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
linux-iio@vger.kernel.org, devel@driverdev.osuosl.org,
linux-kernel@vger.kernel.org, outreachy-kernel@googlegroups.com
Subject: [PATCH] staging: ad7759: Replace mlock with driver private lock
Date: Mon, 20 Mar 2017 21:39:26 +0530 [thread overview]
Message-ID: <20170320160926.GA7088@arushi-HP-Pavilion-Notebook> (raw)
The IIO subsystem is redefining iio_dev->mlock to be used by
the IIO core only for protecting device operating mode changes.
ie. Changes between INDIO_DIRECT_MODE, INDIO_BUFFER_* modes.
In this driver, mlock was being used to protect hardware state
changes. Replace it with a lock in the devices global data.
Signed-off-by: Arushi Singhal <arushisinghal19971997@gmail.com>
---
drivers/staging/iio/meter/ade7759.c | 4 ++--
drivers/staging/iio/meter/ade7759.h | 1 +
2 files changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/staging/iio/meter/ade7759.c b/drivers/staging/iio/meter/ade7759.c
index 944ee3401029..1d1e0b33021f 100644
--- a/drivers/staging/iio/meter/ade7759.c
+++ b/drivers/staging/iio/meter/ade7759.c
@@ -381,7 +381,7 @@ static ssize_t ade7759_write_frequency(struct device *dev,
if (!val)
return -EINVAL;
- mutex_lock(&indio_dev->mlock);
+ mutex_lock(&st->buf_lock);
t = 27900 / val;
if (t > 0)
@@ -402,7 +402,7 @@ static ssize_t ade7759_write_frequency(struct device *dev,
ret = ade7759_spi_write_reg_16(dev, ADE7759_MODE, reg);
out:
- mutex_unlock(&indio_dev->mlock);
+ mutex_unlock(&st->buf_lock);
return ret ? ret : len;
}
diff --git a/drivers/staging/iio/meter/ade7759.h b/drivers/staging/iio/meter/ade7759.h
index f0716d2fdf8e..4f69bb93cc45 100644
--- a/drivers/staging/iio/meter/ade7759.h
+++ b/drivers/staging/iio/meter/ade7759.h
@@ -42,6 +42,7 @@
* @buf_lock: mutex to protect tx and rx
* @tx: transmit buffer
* @rx: receive buffer
+ * @lock protect sensor state
**/
struct ade7759_state {
struct spi_device *us;
--
2.11.0
next reply other threads:[~2017-03-20 16:11 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-03-20 16:09 Arushi Singhal [this message]
2017-03-22 20:33 ` [PATCH] staging: ad7759: Replace mlock with driver private lock Jonathan Cameron
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