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: Zefan Li <lizefan@huawei.com>

diff --git a/drivers/staging/iio/meter/ade7758_ring.c b/drivers/staging/iio/meter/ade7758_ring.c
index c45b23bb122964f69c0b46dbe8ee5bcc44648fc3..629a6ed2c6edc83e18962b7d5425837cb9b2383d 100644 (file)
--- a/drivers/staging/iio/meter/ade7758_ring.c
+++ b/drivers/staging/iio/meter/ade7758_ring.c
@@ -96,7 +96,7 @@ static int ade7758_ring_preenable(struct iio_dev *indio_dev)
        size_t d_size;
        unsigned channel;
 
-       if (!bitmap_empty(indio_dev->active_scan_mask, indio_dev->masklength))
+       if (bitmap_empty(indio_dev->active_scan_mask, indio_dev->masklength))
                return -EINVAL;
 
        channel = find_first_bit(indio_dev->active_scan_mask,