[ofa-general] [PATCH] libibmad: Ensure the proper length is passed into umad_recv on each call

[Ira Weiny]

Sasha,

I found that once in a while umad_recv returns a trid from a previously
timedout request and causes _do_madrpc to loop around.  If this occurs the
length value has changed from the previous call and results -EINVAL from the
kernel.  This fixes the problem.

Ira



From: Ira Weiny <weiny2 at hyperion1.llnl.gov>
Date: Tue, 21 Jul 2009 15:24:49 -0700
Subject: [PATCH] libibmad: Ensure the proper length is passed into umad_recv on each call


Signed-off-by: Ira Weiny <weiny2 at hyperion1.llnl.gov>
---
 libibmad/src/rpc.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/libibmad/src/rpc.c b/libibmad/src/rpc.c
index efea1d3..0b989da 100644
--- a/libibmad/src/rpc.c
+++ b/libibmad/src/rpc.c
@@ -158,6 +158,7 @@ _do_madrpc(int port_id, void *sndbuf, void *rcvbuf, int agentid, int len,
 		/* Use same timeout on receive side just in case */
 		/* send packet is lost somewhere. */
 		do {
+			length = len;
 			if (umad_recv(port_id, rcvbuf, &length, timeout) < 0) {
 				IBWARN("recv failed: %m");
 				return -1;
-- 
1.5.4.5