staging: iio: adis16209: Remove mutex_lock() and mutex_unlock() calls

The function adis16209_read_raw() is safe to be run in parallel.
The call to adis_read_reg_16() is safe since adis_read_reg() uses the
txrx_lock from struct adis to protect simultaneous changes.

Remove mutex.h inclusion since it is no longer needed.

Signed-off-by: Narcisa Ana Maria Vasile <narcisaanamaria12@gmail.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

diff --git a/drivers/staging/iio/accel/adis16209.c b/drivers/staging/iio/accel/adis16209.c
index 28705bf..52fa2e0 100644 (file)
--- a/drivers/staging/iio/accel/adis16209.c
+++ b/drivers/staging/iio/accel/adis16209.c
@@ -7,7 +7,6 @@
  */
 
 #include <linux/delay.h>
-#include <linux/mutex.h>
 #include <linux/device.h>
 #include <linux/kernel.h>
 #include <linux/spi/spi.h>
@@ -254,17 +253,14 @@ static int adis16209_read_raw(struct iio_dev *indio_dev,
                default:
                        return -EINVAL;
                }
-               mutex_lock(&indio_dev->mlock);
                addr = adis16209_addresses[chan->scan_index][0];
                ret = adis_read_reg_16(st, addr, &val16);
                if (ret) {
-                       mutex_unlock(&indio_dev->mlock);
                        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;