staging: IIO: IMU: ADIS16400: Make sure only enabled scan_elements are pushed into the ring

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Acked-by: Jonathan Cameron <jic23@cam.ac.uk>
CC: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

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 ac381ca126fc..da28cb4288af 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)