iio: adc: meson-saradc: unlock on error in meson_sar_adc_lock()

commit 3c3e4b3a708a9d6451052e348981f37d2b3e92b0 upstream.

The meson_sar_adc_lock() function is not supposed to hold the
"indio_dev->mlock" on the error path.

Fixes: 3adbf3427330 ("iio: adc: add a driver for the SAR ADC found in Amlogic Meson SoCs")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/iio/adc/meson_saradc.c b/drivers/iio/adc/meson_saradc.c
index 7dc7d29..11484cb 100644 (file)
--- a/drivers/iio/adc/meson_saradc.c
+++ b/drivers/iio/adc/meson_saradc.c
@@ -462,8 +462,10 @@ static int meson_sar_adc_lock(struct iio_dev *indio_dev)
                        regmap_read(priv->regmap, MESON_SAR_ADC_DELAY, &val);
                } while (val & MESON_SAR_ADC_DELAY_BL30_BUSY && timeout--);
 
-               if (timeout < 0)
+               if (timeout < 0) {
+                       mutex_unlock(&indio_dev->mlock);
                        return -ETIMEDOUT;
+               }
        }
 
        return 0;