From: Aishwarya Pant <aishpant@gmail.com>
Date: Fri, 17 Mar 2017 21:43:56 +0000 (+0530)
Subject: staging: iio: accel: adis16201: remove iio_dev mlock
X-Git-Tag: v4.12-rc1~84^2~384^2~23
X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=099c4cef24a6cb77e2c03e9e66199d460ed4a5a1;p=uclinux-h8%2Flinux.git

staging: iio: accel: adis16201: remove iio_dev mlock

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>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
---

diff --git a/drivers/staging/iio/accel/adis16201.c b/drivers/staging/iio/accel/adis16201.c
index 75652681eaa7..fbc240663621 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;