exempt instant timeouts from mtu discovery

if we set lastReceiveTime to 0 to hint that no net, honor that here as
"just time out"

Change-Id: Ifb06fad782669649027841e3930ff94600b6c900
Reviewed-on: http://gerrit.openafs.org/2875
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: BuildBot <buildbot@rampaginggeek.com>

diff --git a/src/rx/rx.c b/src/rx/rx.c
index 73a5d57798c99f3b68b64c1b6b0a0ab427beb3f4..9302d423e6f739614fcf899900b5f2dcdf22029a 100644 (file)
--- a/src/rx/rx.c
+++ b/src/rx/rx.c
@@ -5980,11 +5980,12 @@ rxi_CheckCall(struct rx_call *call)
     }
     return 0;
 mtuout:
-    if (conn->msgsizeRetryErr && cerror != RX_CALL_TIMEOUT) {
+    if (conn->msgsizeRetryErr && cerror != RX_CALL_TIMEOUT
+       && call->lastReceiveTime) {
        int oldMTU = conn->peer->ifMTU;
 
        /* if we thought we could send more, perhaps things got worse */
-       if (call->conn->peer->maxPacketSize > conn->lastPacketSize)
+       if (conn->peer->maxPacketSize > conn->lastPacketSize)
            /* maxpacketsize will be cleared in rxi_SetPeerMtu */
            newmtu = MAX(conn->peer->maxPacketSize-RX_IPUDP_SIZE,
                         conn->lastPacketSize-(128+RX_IPUDP_SIZE));