rpc: allow xprt_class->setup to return a preexisting xprt

This allows us to reuse the xprt associated with a server connection if
one has already been set up.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/net/sunrpc/xprt.c b/net/sunrpc/xprt.c
index 749ad15ae305..856274d7e85c 100644
--- a/net/sunrpc/xprt.c
+++ b/net/sunrpc/xprt.c
@@ -1102,6 +1102,9 @@ found:
                                 -PTR_ERR(xprt));
                 return xprt;
         }
+        if (test_and_set_bit(XPRT_INITIALIZED, &xprt->state))
+                /* ->setup returned a pre-initialized xprt: */
+                return xprt;
 
         spin_lock_init(&xprt->transport_lock);
         spin_lock_init(&xprt->reserve_lock);