iio: adc: ad7091r-base: Use auto cleanup of locks.

Done to reduce boilerplate and simplify code flow by allowing early
returns with the lock automatically released.

Reviewed-by: Nuno Sa <nuno.a@analog.com>
Link: https://lore.kernel.org/r/20240128150537.44592-11-jic23@kernel.org
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/adc/ad7091r-base.c b/drivers/iio/adc/ad7091r-base.c
index f4255b91acfc9849df2986f0c619d3f816f3b57c..d6876259ad14499df0983b4744834d66aa789f27 100644 (file)
--- a/drivers/iio/adc/ad7091r-base.c
+++ b/drivers/iio/adc/ad7091r-base.c
@@ -86,28 +86,25 @@ static int ad7091r_read_raw(struct iio_dev *iio_dev,
        unsigned int read_val;
        int ret;
 
-       mutex_lock(&st->lock);
+       guard(mutex)(&st->lock);
 
        switch (m) {
        case IIO_CHAN_INFO_RAW:
-               if (st->mode != AD7091R_MODE_COMMAND) {
-                       ret = -EBUSY;
-                       goto unlock;
-               }
+               if (st->mode != AD7091R_MODE_COMMAND)
+                       return -EBUSY;
 
                ret = ad7091r_read_one(iio_dev, chan->channel, &read_val);
                if (ret)
-                       goto unlock;
+                       return ret;
 
                *val = read_val;
-               ret = IIO_VAL_INT;
-               break;
+               return IIO_VAL_INT;
 
        case IIO_CHAN_INFO_SCALE:
                if (st->vref) {
                        ret = regulator_get_voltage(st->vref);
                        if (ret < 0)
-                               goto unlock;
+                               return ret;
 
                        *val = ret / 1000;
                } else {
@@ -115,17 +112,11 @@ static int ad7091r_read_raw(struct iio_dev *iio_dev,
                }
 
                *val2 = chan->scan_type.realbits;
-               ret = IIO_VAL_FRACTIONAL_LOG2;
-               break;
+               return IIO_VAL_FRACTIONAL_LOG2;
 
        default:
-               ret = -EINVAL;
-               break;
+               return -EINVAL;
        }
-
-unlock:
-       mutex_unlock(&st->lock);
-       return ret;
 }
 
 static int ad7091r_read_event_config(struct iio_dev *indio_dev,