[PATCH 3.12 141/206] staging:iio:ade7758: Fix check if channels are enabled in prenable

From: Jiri Slaby
Date: Tue Nov 18 2014 - 09:42:12 EST

From: Lars-Peter Clausen <lars@xxxxxxxxxx>

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


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: Jiri Slaby <jslaby@xxxxxxx>
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 6590944a6678..46eb15d25d4b 100644
--- 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);

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