[PATCH] SCTP: Initialize partial_bytes_acked to 0, when all of the data is acked.

[Gui Jianfeng <guijianfeng@cn.fujitsu.com>]

Vlad,
According to RFC4960 7.2.2, 
When all of the data transmitted by the sender has
been acknowledged by the recerver, partial_bytes_acked is initialized to 0.

This patch conforms to rfc requirement. 
Without this fix, cwnd might be error incremented.

Signed-off-by: Gui Jianfeng <guijianfeng@cn.fujitsu.com>
---
 net/sctp/outqueue.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/net/sctp/outqueue.c b/net/sctp/outqueue.c
index c071446..cf79485 100644
--- a/net/sctp/outqueue.c
+++ b/net/sctp/outqueue.c
@@ -1544,6 +1544,9 @@ static void sctp_check_transmitted(struct sctp_outq *q,
 						  bytes_acked);
 
 			transport->flight_size -= bytes_acked;
+			if (transport->flight_size == 0) {
+				transport->partial_bytes_acked = 0;
+			}
 			q->outstanding_bytes -= bytes_acked;
 		} else {
 			/* RFC 2960 6.1, sctpimpguide-06 2.15.2
-- 
1.5.3