[PATCH] greybus: audio: extract topology size retrieval into a helper

[Hungyu Lin <dennylin0707@gmail.com>]

The topology retrieval code currently mixes the size query with
allocation and data fetch in a single function.

Extract the size query into a helper to make the control flow clearer.

No functional change.

Signed-off-by: Hungyu Lin <dennylin0707@gmail.com>
---
 drivers/staging/greybus/audio_gb.c | 20 ++++++++++++++++----
 1 file changed, 16 insertions(+), 4 deletions(-)

diff --git a/drivers/staging/greybus/audio_gb.c b/drivers/staging/greybus/audio_gb.c
index 9d8994fdb41a..d95f8b7d4ce2 100644
--- a/drivers/staging/greybus/audio_gb.c
+++ b/drivers/staging/greybus/audio_gb.c
@@ -8,21 +8,33 @@
 #include <linux/greybus.h>
 #include "audio_codec.h"
 
+static int gb_audio_gb_get_topology_size(struct gb_connection *connection,
+					 u16 *size)
+{
+	struct gb_audio_get_topology_size_response size_resp;
+	int ret;
+
+	ret = gb_operation_sync(connection, GB_AUDIO_TYPE_GET_TOPOLOGY_SIZE,
+				NULL, 0, &size_resp, sizeof(size_resp));
+	if (ret)
+		return ret;
+
+	*size = le16_to_cpu(size_resp.size);
+	return 0;
+}
+
 /* TODO: Split into separate calls */
 int gb_audio_gb_get_topology(struct gb_connection *connection,
 			     struct gb_audio_topology **topology)
 {
-	struct gb_audio_get_topology_size_response size_resp;
 	struct gb_audio_topology *topo;
 	u16 size;
 	int ret;
 
-	ret = gb_operation_sync(connection, GB_AUDIO_TYPE_GET_TOPOLOGY_SIZE,
-				NULL, 0, &size_resp, sizeof(size_resp));
+	ret = gb_audio_gb_get_topology_size(connection, &size);
 	if (ret)
 		return ret;
 
-	size = le16_to_cpu(size_resp.size);
 	if (size < sizeof(*topo))
 		return -ENODATA;
 
-- 
2.34.1