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 9f77530..6e71d6a 100644 (file)
--- 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 940dba9..4dd5b3c 100644 (file)
--- 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);