diff options
Diffstat (limited to 'drivers/staging')
| -rw-r--r-- | drivers/staging/iio/industrialio-buffer.c | 17 |
1 files changed, 12 insertions, 5 deletions
diff --git a/drivers/staging/iio/industrialio-buffer.c b/drivers/staging/iio/industrialio-buffer.c index 747b9013a66..59472890cb2 100644 --- a/drivers/staging/iio/industrialio-buffer.c +++ b/drivers/staging/iio/industrialio-buffer.c @@ -396,13 +396,20 @@ ssize_t iio_buffer_write_length(struct device *dev, if (val == buffer->access->get_length(buffer)) return len; - if (buffer->access->set_length) { - buffer->access->set_length(buffer, val); - if (buffer->access->mark_param_change) - buffer->access->mark_param_change(buffer); + mutex_lock(&indio_dev->mlock); + if (iio_buffer_enabled(indio_dev)) { + ret = -EBUSY; + } else { + if (buffer->access->set_length) { + buffer->access->set_length(buffer, val); + if (buffer->access->mark_param_change) + buffer->access->mark_param_change(buffer); + } + ret = 0; } + mutex_unlock(&indio_dev->mlock); - return len; + return ret ? ret : len; } EXPORT_SYMBOL(iio_buffer_write_length); |