[RFC PATCH 09/14] iio: buffer: split buffer sysfs creation to take buffer as primary arg

[Alexandru Ardelean <alexandru.ardelean@analog.com>]

Currently the iio_buffer_{alloc,free}_sysfs_and_mask() take 'indio_dev' as
primary argument. This change converts to take an IIO buffer as a primary
argument.

That will allow the functions to get called for multiple buffers.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
---
 drivers/iio/industrialio-buffer.c | 46 ++++++++++++++++++++-----------
 1 file changed, 30 insertions(+), 16 deletions(-)

diff --git a/drivers/iio/industrialio-buffer.c b/drivers/iio/industrialio-buffer.c
index e7a847e7b103..6b1b5d5387bd 100644
--- a/drivers/iio/industrialio-buffer.c
+++ b/drivers/iio/industrialio-buffer.c
@@ -1312,26 +1312,14 @@ static struct attribute *iio_buffer_attrs[] = {
 	&dev_attr_data_available.attr,
 };
 
-int iio_buffer_alloc_sysfs_and_mask(struct iio_dev *indio_dev)
+static int __iio_buffer_alloc_sysfs_and_mask(struct iio_buffer *buffer)
 {
+	struct iio_dev *indio_dev = buffer->indio_dev;
 	struct iio_dev_attr *p;
 	struct attribute **attr;
-	struct iio_buffer *buffer = indio_dev->buffer;
 	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;
-
 	attrcount = 0;
 	if (buffer->attrs) {
 		while (buffer->attrs[attrcount] != NULL)
@@ -1411,19 +1399,45 @@ int iio_buffer_alloc_sysfs_and_mask(struct iio_dev *indio_dev)
 	return ret;
 }
 
-void iio_buffer_free_sysfs_and_mask(struct iio_dev *indio_dev)
+int iio_buffer_alloc_sysfs_and_mask(struct iio_dev *indio_dev)
 {
 	struct iio_buffer *buffer = indio_dev->buffer;
+	const struct iio_chan_spec *channels;
+	int i;
+
+	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;
+		return 0;
+
+	return __iio_buffer_alloc_sysfs_and_mask(buffer);
+}
 
+static void __iio_buffer_free_sysfs_and_mask(struct iio_buffer *buffer)
+{
 	iio_buffer_free_scanmask(buffer);
 	kfree(buffer->buffer_group.attrs);
 	kfree(buffer->scan_el_group.attrs);
 	iio_free_chan_devattr_list(&buffer->scan_el_dev_attr_list);
 }
 
+void iio_buffer_free_sysfs_and_mask(struct iio_dev *indio_dev)
+{
+	struct iio_buffer *buffer = indio_dev->buffer;
+
+	if (!buffer)
+		return;
+
+	__iio_buffer_free_sysfs_and_mask(buffer);
+}
+
 static const struct file_operations iio_buffer_fileops = {
 	.read = iio_buffer_read_outer,
 	.release = iio_buffer_chrdev_release,
-- 
2.17.1