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iio: Always compute masklength 

Even if no userspace consumer buffer is attached to the IIO device at
registration we still need to compute the masklength, since it is possible
that a in-kernel consumer buffer is going to get attached to the device at
a later point.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Lars-Peter Clausen 2015-05-29 18:14:20 +02:00 committed by Jonathan Cameron
parent 4dcaa5f754
commit 629bc02331
1 changed files with 9 additions and 6 deletions
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15
drivers/iio/industrialio-buffer.c
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@ -966,6 +966,15 @@ int iio_buffer_alloc_sysfs_and_mask(struct iio_dev *indio_dev)
int ret, i, attrn, attrcount, attrcount_orig = 0;
const struct iio_chan_spec *channels;
channels = indio_dev->channels;
if (channels) {
int ml = indio_dev->masklength;
for (i = 0; i < indio_dev->num_channels; i++)
ml = max(ml, channels[i].scan_index + 1);
indio_dev->masklength = ml;
}
if (!buffer)
return 0;
@ -1009,12 +1018,6 @@ int iio_buffer_alloc_sysfs_and_mask(struct iio_dev *indio_dev)
if (channels[i].scan_index < 0)
continue;
/* Establish necessary mask length */
if (channels[i].scan_index >
(int)indio_dev->masklength - 1)
indio_dev->masklength
= channels[i].scan_index + 1;
ret = iio_buffer_add_channel_sysfs(indio_dev,
&channels[i]);
if (ret < 0)