NFS: Add memory barriers to the nfs_client->cl_cons_state initialisation
Ensure that a process that uses the nfs_client->cl_cons_state test
for whether the initialisation process is finished does not read
stale data.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/client.c b/fs/nfs/client.c
index d356642..a50bdfb 100644
--- a/fs/nfs/client.c
+++ b/fs/nfs/client.c
@@ -459,6 +459,8 @@
clp->cl_cons_state == NFS_CS_SESSION_INITING))
return false;
+ smp_rmb();
+
/* Match the version and minorversion */
if (clp->rpc_ops->version != 4 ||
clp->cl_minorversion != minorversion)
@@ -539,6 +541,8 @@
return ERR_PTR(error);
}
+ smp_rmb();
+
BUG_ON(clp->cl_cons_state != NFS_CS_READY);
dprintk("<-- %s found nfs_client %p for %s\n",
@@ -597,6 +601,7 @@
*/
void nfs_mark_client_ready(struct nfs_client *clp, int state)
{
+ smp_wmb();
clp->cl_cons_state = state;
wake_up_all(&nfs_client_active_wq);
}