staging: iio: adis16240: Remove mutex_lock() and mutex_unlock() function call.

Remove mutex_lock() and mutex_unlock() function calls, as the
adis16240_spi_read_signed() function can be run parallel and safely
multiple times. Also remove the mutex.h header file and comment, which
are no longer required.

As indio_dev is declared and initialized in adis16240_spi_read_signed(),
again declaration to same type and initialization to same value is not
required, remove it from adis16240_read_12bit_signed().

Simplify the return logic, by merging assignment and return into a single
line.

Signed-off-by: Varsha Rao <rvarsha016@gmail.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

diff --git a/drivers/staging/iio/accel/adis16240.c b/drivers/staging/iio/accel/adis16240.c
index b0f449dda88bf309a22e595b94b10eeb4ef07f51..6e3c95c9c3f60441091a192867a30f800b553402 100644 (file)
--- a/drivers/staging/iio/accel/adis16240.c
+++ b/drivers/staging/iio/accel/adis16240.c
@@ -10,7 +10,6 @@
 #include <linux/irq.h>
 #include <linux/gpio.h>
 #include <linux/delay.h>
-#include <linux/mutex.h>
 #include <linux/device.h>
 #include <linux/kernel.h>
 #include <linux/spi/spi.h>
@@ -229,15 +228,7 @@ static ssize_t adis16240_read_12bit_signed(struct device *dev,
                                           struct device_attribute *attr,
                                           char *buf)
 {
-       ssize_t ret;
-       struct iio_dev *indio_dev = dev_to_iio_dev(dev);
-
-       /* Take the iio_dev status lock */
-       mutex_lock(&indio_dev->mlock);
-       ret =  adis16240_spi_read_signed(dev, attr, buf, 12);
-       mutex_unlock(&indio_dev->mlock);
-
-       return ret;
+       return adis16240_spi_read_signed(dev, attr, buf, 12);
 }
 
 static IIO_DEVICE_ATTR(in_accel_xyz_squared_peak_raw, 0444,
@@ -297,31 +288,25 @@ static int adis16240_read_raw(struct iio_dev *indio_dev,
                return IIO_VAL_INT;
        case IIO_CHAN_INFO_CALIBBIAS:
                bits = 10;
-               mutex_lock(&indio_dev->mlock);
                addr = adis16240_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;
        case IIO_CHAN_INFO_PEAK:
                bits = 10;
-               mutex_lock(&indio_dev->mlock);
                addr = adis16240_addresses[chan->scan_index][1];
                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;