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Date: Sat, 18 Mar 2017 03:13:56 +0530
From: Aishwarya Pant <aishpant@gmail.com>
To: Lars-Peter Clausen <lars@metafoo.de>,
	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>,
	Barry Song <21cnbao@gmail.com>
Cc: outreachy-kernel@googlegroups.com, linux-iio@vger.kernel.org
Subject: [PATCH v3] staging: iio: accel: adis16201: remove iio_dev mlock
Message-ID: <20170317214356.GA8369@aishwarya>
MIME-Version: 1.0
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User-Agent: Mutt/1.5.24 (2015-08-30)

In the driver adis16201 read raw does not require an iio_dev->mlock for
reads. It can run concurrently as adis_read_reg_16() is protected by a
transaction lock.

Signed-off-by: Aishwarya Pant <aishpant@gmail.com>

---
Changes in v3:
	-- Fix change log format
	-- Send patch to linuc-iio
Changes in v2:
	-- Remove read lock

 drivers/staging/iio/accel/adis16201.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/drivers/staging/iio/accel/adis16201.c b/drivers/staging/iio/accel/adis16201.c
index d6c8658..fd2baf2 100644
--- a/drivers/staging/iio/accel/adis16201.c
+++ b/drivers/staging/iio/accel/adis16201.c
@@ -223,17 +223,13 @@ static int adis16201_read_raw(struct iio_dev *indio_dev,
 		default:
 			return -EINVAL;
 		}
-		mutex_lock(&indio_dev->mlock);
 		addr = adis16201_addresses[chan->scan_index];
 		ret = adis_read_reg_16(st, addr, &val16);
-		if (ret) {
-			mutex_unlock(&indio_dev->mlock);
+		if (ret)
 			return ret;
-		}
 		val16 &= (1 << bits) - 1;
 		val16 = (s16)(val16 << (16 - bits)) >> (16 - bits);
 		*val = val16;
-		mutex_unlock(&indio_dev->mlock);
 		return IIO_VAL_INT;
 	}
 	return -EINVAL;
-- 
2.7.4