[PATCH 21/28] staging: IIO: IMU: ADIS16400: Make sure only enabled scan_elements are pushed into the ring

[Greg Kroah-Hartman]

From: Michael Hennerich <michael.hennerich at analog.com>

Signed-off-by: Michael Hennerich <michael.hennerich at analog.com>
Acked-by: Jonathan Cameron <jic23 at cam.ac.uk>
CC: stable <stable at kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh at suse.de>
---
 drivers/staging/iio/imu/adis16400_ring.c |   10 +++++++---
 1 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/iio/imu/adis16400_ring.c b/drivers/staging/iio/imu/adis16400_ring.c
index ac381ca..da28cb4 100644
--- a/drivers/staging/iio/imu/adis16400_ring.c
+++ b/drivers/staging/iio/imu/adis16400_ring.c
@@ -160,9 +160,10 @@ static void adis16400_trigger_bh_to_ring(struct work_struct *work_s)
 			       work_trigger_to_ring);
 	struct iio_ring_buffer *ring = st->indio_dev->ring;
 
-	int i = 0;
+	int i = 0, j;
 	s16 *data;
 	size_t datasize = ring->access.get_bytes_per_datum(ring);
+	unsigned long mask = ring->scan_mask;
 
 	data = kmalloc(datasize , GFP_KERNEL);
 	if (data == NULL) {
@@ -172,9 +173,12 @@ static void adis16400_trigger_bh_to_ring(struct work_struct *work_s)
 
 	if (ring->scan_count)
 		if (adis16400_spi_read_burst(&st->indio_dev->dev, st->rx) >= 0)
-			for (; i < ring->scan_count; i++)
+			for (; i < ring->scan_count; i++) {
+				j = __ffs(mask);
+				mask &= ~(1 << j);
 				data[i]	= be16_to_cpup(
-					(__be16 *)&(st->rx[i*2]));
+					(__be16 *)&(st->rx[j*2]));
+			}
 
 	/* Guaranteed to be aligned with 8 byte boundary */
 	if (ring->scan_timestamp)
-- 
1.7.4.2