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>

1 files changed, 2 insertions, 2 deletions

diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
index d10ebc4310f7..8a19849ff340 100644
--- 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;