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

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Message-Id: <1417548000-1794-34-git-send-email-kamal@canonical.com>
Date:	Tue,  2 Dec 2014 11:18:32 -0800
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Lars-Peter Clausen <lars@...afoo.de>,
	Jonathan Cameron <jic23@...nel.org>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.13.y-ckt 033/121] staging:iio:ade7758: Fix check if channels are enabled in prenable

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

------------------

From: Lars-Peter Clausen <lars@...afoo.de>

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@...afoo.de>
Signed-off-by: Jonathan Cameron <jic23@...nel.org>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 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,
-- 
1.9.1

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