iio: stk3310: Don't return error code in interrupt handler

Interrupt handlers must return one of the irqreturn_t values. Returning a
error code is not supported.

The stk3310 event interrupt handler returns an error code when reading the
flags register fails.

Fix the implementation to always return an irqreturn_t value.

Fixes: 3dd477acbdd1 ("iio: light: Add threshold interrupt support for STK3310")
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Link: https://lore.kernel.org/r/20211024171251.22896-3-lars@metafoo.de
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/light/stk3310.c b/drivers/iio/light/stk3310.c
index 07e9184..fc63856 100644 (file)
--- a/drivers/iio/light/stk3310.c
+++ b/drivers/iio/light/stk3310.c
@@ -546,9 +546,8 @@ static irqreturn_t stk3310_irq_event_handler(int irq, void *private)
        mutex_lock(&data->lock);
        ret = regmap_field_read(data->reg_flag_nf, &dir);
        if (ret < 0) {
-               dev_err(&data->client->dev, "register read failed\n");
-               mutex_unlock(&data->lock);
-               return ret;
+               dev_err(&data->client->dev, "register read failed: %d\n", ret);
+               goto out;
        }
        event = IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 1,
                                     IIO_EV_TYPE_THRESH,
@@ -560,6 +559,7 @@ static irqreturn_t stk3310_irq_event_handler(int irq, void *private)
        ret = regmap_field_write(data->reg_flag_psint, 0);
        if (ret < 0)
                dev_err(&data->client->dev, "failed to reset interrupts\n");
+out:
        mutex_unlock(&data->lock);
 
        return IRQ_HANDLED;