diff options
| author | Trond Myklebust <Trond.Myklebust@netapp.com> | 2006-03-20 19:44:51 +0100 |
|---|---|---|
| committer | Trond Myklebust <Trond.Myklebust@netapp.com> | 2006-03-20 19:44:51 +0100 |
| commit | 43ac3f2961b8616da26114ec6dc76ac2a61f76ad (patch) | |
| tree | 461fc961f6c7d9a724425654523cf61cb6c2e485 /net | |
| parent | NFS: Fix a race in nfs_sync_inode() (diff) | |
| download | linux-43ac3f2961b8616da26114ec6dc76ac2a61f76ad.tar.xz linux-43ac3f2961b8616da26114ec6dc76ac2a61f76ad.zip | |
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>
Diffstat (limited to 'net')
| -rw-r--r-- | net/sunrpc/clnt.c | 5 | ||||
| -rw-r--r-- | net/sunrpc/xprt.c | 3 |
2 files changed, 7 insertions, 1 deletions
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); |