SUNRPC: Don't take transport->lock unnecessarily when taking XPRT_LOCK

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>

diff --git a/net/sunrpc/xprt.c b/net/sunrpc/xprt.c
index c86a5df..11133ba 100644 (file)
--- a/net/sunrpc/xprt.c
+++ b/net/sunrpc/xprt.c
@@ -298,6 +298,8 @@ static inline int xprt_lock_write(struct rpc_xprt *xprt, struct rpc_task *task)
 {
        int retval;
 
+       if (test_bit(XPRT_LOCKED, &xprt->state) && xprt->snd_task == task)
+               return 1;
        spin_lock_bh(&xprt->transport_lock);
        retval = xprt->ops->reserve_xprt(xprt, task);
        spin_unlock_bh(&xprt->transport_lock);
@@ -375,6 +377,8 @@ EXPORT_SYMBOL_GPL(xprt_release_xprt_cong);
 
 static inline void xprt_release_write(struct rpc_xprt *xprt, struct rpc_task *task)
 {
+       if (xprt->snd_task != task)
+               return;
        spin_lock_bh(&xprt->transport_lock);
        xprt->ops->release_xprt(xprt, task);
        spin_unlock_bh(&xprt->transport_lock);
@@ -1645,8 +1649,7 @@ void xprt_release(struct rpc_task *task)
        if (req == NULL) {
                if (task->tk_client) {
                        xprt = task->tk_xprt;
-                       if (xprt->snd_task == task)
-                               xprt_release_write(xprt, task);
+                       xprt_release_write(xprt, task);
                }
                return;
        }