staging:iio:ade7758: Fix check if channels are enabled in prenable

commit 79fa64eb2ee8ccb4bcad7f54caa2699730b10b22 upstream.

We should check if a channel is enabled, not if no channels are enabled.

Fixes: 550268ca1111 ("staging:iio: scrap scan_count and ensure all drivers use active_scan_mask")
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/iio/meter/ade7758_ring.c b/drivers/staging/iio/meter/ade7758_ring.c
index 25e1b45b6c40320f078baab238746440da8a6c43..6a0ef97e9146535514960996313f47a4bde362dc 100644 (file)
--- a/drivers/staging/iio/meter/ade7758_ring.c
+++ b/drivers/staging/iio/meter/ade7758_ring.c
@@ -92,7 +92,7 @@ static int ade7758_ring_preenable(struct iio_dev *indio_dev)
        unsigned channel;
        int ret;
 
-       if (!bitmap_empty(indio_dev->active_scan_mask, indio_dev->masklength))
+       if (bitmap_empty(indio_dev->active_scan_mask, indio_dev->masklength))
                return -EINVAL;
 
        ret = iio_sw_buffer_preenable(indio_dev);