SUNRPC: skip clients with program without PipeFS entries

1) This is sane.
2) Otherwise there will be soft lockup:

do {
	rpc_get_client_for_event (clnt->cl_dentry == NULL ==> choose)
	__rpc_pipefs_event (clnt->cl_program->pipe_dir_name == NULL ==> return)
} while (1)

Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
index d10ebc4..8a19849 100644 (file)
--- a/net/sunrpc/clnt.c
+++ b/net/sunrpc/clnt.c
@@ -184,8 +184,6 @@ static int __rpc_pipefs_event(struct rpc_clnt *clnt, unsigned long event,
 
        switch (event) {
        case RPC_PIPEFS_MOUNT:
-               if (clnt->cl_program->pipe_dir_name == NULL)
-                       break;
                dentry = rpc_setup_pipedir_sb(sb, clnt,
                                              clnt->cl_program->pipe_dir_name);
                BUG_ON(dentry == NULL);
@@ -215,6 +213,8 @@ static struct rpc_clnt *rpc_get_client_for_event(struct net *net, int event)
 
        spin_lock(&sn->rpc_client_lock);
        list_for_each_entry(clnt, &sn->all_clients, cl_clients) {
+               if (clnt->cl_program->pipe_dir_name == NULL)
+                       break;
                if (((event == RPC_PIPEFS_MOUNT) && clnt->cl_dentry) ||
                    ((event == RPC_PIPEFS_UMOUNT) && !clnt->cl_dentry))
                        continue;