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authorMarcelo Ricardo Leitner <marcelo.leitner@gmail.com>2016-03-19 00:39:18 +0300
committerDavid S. Miller <davem@davemloft.net>2016-03-20 23:31:11 +0300
commit07b4d6a1749422fa1e054f3c2aba444acdba39e8 (patch)
tree6474dfe18a02acadb6a3fee23d2719af33601202 /net
parentabbdb5a74cead60e20b79c960c1772955f0b6b81 (diff)
downloadlinux-07b4d6a1749422fa1e054f3c2aba444acdba39e8.tar.xz
sctp: do not update a_rwnd if we are not issuing a sack
The SACK can be lost pretty much elsewhere, but if its allocation fail, we know we are not sending it, so it is better to revert a_rwnd to its previous value as this may give it a chance to issue a window update later. Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/sctp/sm_sideeffect.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/net/sctp/sm_sideeffect.c b/net/sctp/sm_sideeffect.c
index 3c22c41a2bc2..7fe56d0acabf 100644
--- a/net/sctp/sm_sideeffect.c
+++ b/net/sctp/sm_sideeffect.c
@@ -215,10 +215,14 @@ static int sctp_gen_sack(struct sctp_association *asoc, int force,
sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART,
SCTP_TO(SCTP_EVENT_TIMEOUT_SACK));
} else {
+ __u32 old_a_rwnd = asoc->a_rwnd;
+
asoc->a_rwnd = asoc->rwnd;
sack = sctp_make_sack(asoc);
- if (!sack)
+ if (!sack) {
+ asoc->a_rwnd = old_a_rwnd;
goto nomem;
+ }
asoc->peer.sack_needed = 0;
asoc->peer.sack_cnt = 0;