iio: buffer: refactor buffer attributes setup
Move all core (non-custom) buffer attributes to a vector to make it
easier to add more of them in the future.
Signed-off-by: Octavian Purdila <octavian.purdila@intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
diff --git a/drivers/iio/industrialio-buffer.c b/drivers/iio/industrialio-buffer.c
index 7133314..c2d5440 100644
--- a/drivers/iio/industrialio-buffer.c
+++ b/drivers/iio/industrialio-buffer.c
@@ -761,6 +761,11 @@
static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR,
iio_buffer_show_enable, iio_buffer_store_enable);
+static struct attribute *iio_buffer_attrs[] = {
+ &dev_attr_length.attr,
+ &dev_attr_enable.attr,
+};
+
int iio_buffer_alloc_sysfs_and_mask(struct iio_dev *indio_dev)
{
struct iio_dev_attr *p;
@@ -778,21 +783,23 @@
attrcount++;
}
- buffer->buffer_group.name = "buffer";
- buffer->buffer_group.attrs = kcalloc(attrcount + 3,
- sizeof(*buffer->buffer_group.attrs), GFP_KERNEL);
- if (!buffer->buffer_group.attrs)
+ attr = kcalloc(attrcount + ARRAY_SIZE(iio_buffer_attrs) + 1,
+ sizeof(struct attribute *), GFP_KERNEL);
+ if (!attr)
return -ENOMEM;
- if (buffer->access->set_length)
- buffer->buffer_group.attrs[0] = &dev_attr_length.attr;
- else
- buffer->buffer_group.attrs[0] = &dev_attr_length_ro.attr;
- buffer->buffer_group.attrs[1] = &dev_attr_enable.attr;
+ memcpy(attr, iio_buffer_attrs, sizeof(iio_buffer_attrs));
+ if (!buffer->access->set_length)
+ attr[0] = &dev_attr_length_ro.attr;
+
if (buffer->attrs)
- memcpy(&buffer->buffer_group.attrs[2], buffer->attrs,
- sizeof(*&buffer->buffer_group.attrs) * attrcount);
- buffer->buffer_group.attrs[attrcount+2] = NULL;
+ memcpy(&attr[ARRAY_SIZE(iio_buffer_attrs)], buffer->attrs,
+ sizeof(struct attribute *) * attrcount);
+
+ attr[attrcount + ARRAY_SIZE(iio_buffer_attrs)] = NULL;
+
+ buffer->buffer_group.name = "buffer";
+ buffer->buffer_group.attrs = attr;
indio_dev->groups[indio_dev->groupcounter++] = &buffer->buffer_group;