iio: buffer: Fix demux table creation

commit 61bd55ce1667809f022be88da77db17add90ea4e upstream.

When creating the demux table we need to iterate over the selected scan mask for
the buffer to get the samples which should be copied to destination buffer.
Right now the code uses the mask which contains all active channels, which means
the demux table contains entries which causes it to copy all the samples from
source to destination buffer one by one without doing any demuxing.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/iio/industrialio-buffer.c b/drivers/iio/industrialio-buffer.c
index fe25042f056a9844e8662fd19b0f0f02c85b3e6e..0f1d9b2ccdfa9fdd50bc74ed12541ed938ec0389 100644 (file)
--- a/drivers/iio/industrialio-buffer.c
+++ b/drivers/iio/industrialio-buffer.c
@@ -953,7 +953,7 @@ static int iio_buffer_update_demux(struct iio_dev *indio_dev,
 
        /* Now we have the two masks, work from least sig and build up sizes */
        for_each_set_bit(out_ind,
-                        indio_dev->active_scan_mask,
+                        buffer->scan_mask,
                         indio_dev->masklength) {
                in_ind = find_next_bit(indio_dev->active_scan_mask,
                                       indio_dev->masklength,