sctp: rwnd_press should be cumulative

rwnd_press tracks the pressure on the recieve window.  Every
timer the receive buffer overlows, we truncate the receive
window and then grow it back.  However, if we don't track
the cumulative presser, it's possible to reach a situation
when receive buffer is empty, but rwnd stays truncated.

Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>

diff --git a/net/sctp/associola.c b/net/sctp/associola.c
index 37753cd..65f9a7c 100644 (file)
--- a/net/sctp/associola.c
+++ b/net/sctp/associola.c
@@ -1482,7 +1482,7 @@ void sctp_assoc_rwnd_decrease(struct sctp_association *asoc, unsigned len)
        if (asoc->rwnd >= len) {
                asoc->rwnd -= len;
                if (over) {
-                       asoc->rwnd_press = asoc->rwnd;
+                       asoc->rwnd_press += asoc->rwnd;
                        asoc->rwnd = 0;
                }
        } else {