Sep 04 2012

sctp: use list_move_tail instead of list_del/list_add_tail 

Author: Wei Yongjun <yongjun_wei@trendmicro.com.cn>

Using list_move_tail() instead of list_del() + list_add_tail().

spatch with a semantic match is used to found this problem.
(http://coccinelle.lip6.fr/)

Signed-off-by: Wei Yongjun 
Signed-off-by: David S. Miller 

---
 net/sctp/outqueue.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)
 
diff --git a/net/sctp/outqueue.c b/net/sctp/outqueue.c
index 072bf6a..d16632e 100644
--- a/net/sctp/outqueue.c
+++ b/net/sctp/outqueue.c
@@ -591,9 +591,8 @@ static int sctp_outq_flush_rtx(struct sctp_outq *q, struct sctp_packet *pkt,
 		 * next chunk.
 		 */
 		if (chunk->tsn_gap_acked) {
-			list_del(&chunk->transmitted_list);
-			list_add_tail(&chunk->transmitted_list,
-					&transport->transmitted);
+			list_move_tail(&chunk->transmitted_list,
+				       &transport->transmitted);
 			continue;
 		}
 
@@ -657,9 +656,8 @@ redo:
 			/* The append was successful, so add this chunk to
 			 * the transmitted list.
 			 */
-			list_del(&chunk->transmitted_list);
-			list_add_tail(&chunk->transmitted_list,
-					&transport->transmitted);
+			list_move_tail(&chunk->transmitted_list,
+				       &transport->transmitted);
 
 			/* Mark the chunk as ineligible for fast retransmit
 			 * after it is retransmitted.

qlambert