iio:iio_buffer_init(): Only set watermark if not already set

Only initialize the watermark field if it is still 0. This allows drivers
to provide a custom default watermark value. E.g. some driver might have a
fixed watermark or can only support watermarks within a certain range and
the initial value for the watermark should be within this range.

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

diff --git a/drivers/iio/industrialio-buffer.c b/drivers/iio/industrialio-buffer.c
index 7340922..5f2c8c8 100644 (file)
--- a/drivers/iio/industrialio-buffer.c
+++ b/drivers/iio/industrialio-buffer.c
@@ -193,7 +193,8 @@ void iio_buffer_init(struct iio_buffer *buffer)
        INIT_LIST_HEAD(&buffer->buffer_list);
        init_waitqueue_head(&buffer->pollq);
        kref_init(&buffer->ref);
-       buffer->watermark = 1;
+       if (!buffer->watermark)
+               buffer->watermark = 1;
 }
 EXPORT_SYMBOL(iio_buffer_init);