iio: ad7768-1: Call iio_trigger_notify_done() on error

commit 6661146427cbbce6d1fe3dbb11ff1c487f55799a upstream.

IIO trigger handlers must call iio_trigger_notify_done() when done. This
must be done even when an error occurred. Otherwise the trigger will be
seen as busy indefinitely and the trigger handler will never be called
again.

The ad7768-1 driver neglects to call iio_trigger_notify_done() when there
is an error reading the converter data. Fix this by making sure that
iio_trigger_notify_done() is included in the error exit path.

Fixes: a5f8c7da3dbe ("iio: adc: Add AD7768-1 ADC basic support")
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Link: https://lore.kernel.org/r/20211101144055.13858-2-lars@metafoo.de
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/ad7768-1.c b/drivers/iio/adc/ad7768-1.c
index 0f6c1be1cda2c2730ab24e47711cf31389c0cd4c..9e26517870595b5e362960a53e62c53a5716d70d 100644 (file)
--- a/drivers/iio/adc/ad7768-1.c
+++ b/drivers/iio/adc/ad7768-1.c
@@ -470,8 +470,8 @@ static irqreturn_t ad7768_trigger_handler(int irq, void *p)
        iio_push_to_buffers_with_timestamp(indio_dev, &st->data.scan,
                                           iio_get_time_ns(indio_dev));
 
-       iio_trigger_notify_done(indio_dev->trig);
 err_unlock:
+       iio_trigger_notify_done(indio_dev->trig);
        mutex_unlock(&st->lock);
 
        return IRQ_HANDLED;