[PATCH 3.13.y-ckt 033/121] staging:iio:ade7758: Fix check if channels are enabled in prenable

From: Kamal Mostafa
Date: Tue Dec 02 2014 - 14:33:51 EST

3.13.11-ckt12 -stable review patch. If anyone has any objections, please let me know.


From: Lars-Peter Clausen <lars@xxxxxxxxxx>

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@xxxxxxxxxx>
Signed-off-by: Jonathan Cameron <jic23@xxxxxxxxxx>
Signed-off-by: Kamal Mostafa <kamal@xxxxxxxxxxxxx>
drivers/staging/iio/meter/ade7758_ring.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/iio/meter/ade7758_ring.c b/drivers/staging/iio/meter/ade7758_ring.c
index 628e902..6e90064 100644
--- a/drivers/staging/iio/meter/ade7758_ring.c
+++ b/drivers/staging/iio/meter/ade7758_ring.c
@@ -87,7 +87,7 @@ static int ade7758_ring_preenable(struct iio_dev *indio_dev)
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,

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