From: Trond Myklebust <Trond.Myklebust@netapp.com>
Date: Mon, 20 Mar 2006 18:44:51 +0000 (-0500)
Subject: SUNRPC: Fix memory barriers for req->rq_received
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=43ac3f2961b8616da26114ec6dc76ac2a61f76ad;p=linux-beck.git

SUNRPC: Fix memory barriers for req->rq_received

We need to ensure that all writes to the XDR buffers are done before
req->rq_received is visible to other processors.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
---

diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
index 9f775302d1df..6e71d6ace5a3 100644
--- a/net/sunrpc/clnt.c
+++ b/net/sunrpc/clnt.c
@@ -1069,6 +1069,11 @@ call_decode(struct rpc_task *task)
 		return;
 	}
 
+	/*
+	 * Ensure that we see all writes made by xprt_complete_rqst()
+	 * before it changed req->rq_received.
+	 */
+	smp_rmb();
 	req->rq_rcv_buf.len = req->rq_private_buf.len;
 
 	/* Check that the softirq receive buffer is valid */
diff --git a/net/sunrpc/xprt.c b/net/sunrpc/xprt.c
index 940dba965bb9..4dd5b3cfe754 100644
--- a/net/sunrpc/xprt.c
+++ b/net/sunrpc/xprt.c
@@ -651,6 +651,8 @@ void xprt_complete_rqst(struct rpc_task *task, int copied)
 	task->tk_rtt = (long)jiffies - req->rq_xtime;
 
 	list_del_init(&req->rq_list);
+	/* Ensure all writes are done before we update req->rq_received */
+	smp_wmb();
 	req->rq_received = req->rq_private_buf.len = copied;
 	rpc_wake_up_task(task);
 }
@@ -727,7 +729,6 @@ void xprt_transmit(struct rpc_task *task)
 
 	dprintk("RPC: %4d xprt_transmit(%u)\n", task->tk_pid, req->rq_slen);
 
-	smp_rmb();
 	if (!req->rq_received) {
 		if (list_empty(&req->rq_list)) {
 			spin_lock_bh(&xprt->transport_lock);