x86: Avoid calling arch_trigger_all_cpu_backtrace() at the same time

[firefly-linux-kernel-4.4.55.git] / net / sunrpc / svc_xprt.c

diff --git a/net/sunrpc/svc_xprt.c b/net/sunrpc/svc_xprt.c
index ea2ff78dcf7b7ec4f2555210af82379017e6e291..3f2c5559ca1a49a496b9d531625c1e175fb029c8 100644 (file)
--- a/net/sunrpc/svc_xprt.c
+++ b/net/sunrpc/svc_xprt.c
@@ -212,6 +212,7 @@ int svc_create_xprt(struct svc_serv *serv, const char *xprt_name,
        spin_lock(&svc_xprt_class_lock);
        list_for_each_entry(xcl, &svc_xprt_class_list, xcl_list) {
                struct svc_xprt *newxprt;
+               unsigned short newport;
 
                if (strcmp(xprt_name, xcl->xcl_name))
                        continue;
@@ -230,8 +231,9 @@ int svc_create_xprt(struct svc_serv *serv, const char *xprt_name,
                spin_lock_bh(&serv->sv_lock);
                list_add(&newxprt->xpt_list, &serv->sv_permsocks);
                spin_unlock_bh(&serv->sv_lock);
+               newport = svc_xprt_local_port(newxprt);
                clear_bit(XPT_BUSY, &newxprt->xpt_flags);
-               return svc_xprt_local_port(newxprt);
+               return newport;
        }
  err:
        spin_unlock(&svc_xprt_class_lock);
@@ -425,8 +427,13 @@ void svc_xprt_received(struct svc_xprt *xprt)
 {
        BUG_ON(!test_bit(XPT_BUSY, &xprt->xpt_flags));
        xprt->xpt_pool = NULL;
+       /* As soon as we clear busy, the xprt could be closed and
+        * 'put', so we need a reference to call svc_xprt_enqueue with:
+        */
+       svc_xprt_get(xprt);
        clear_bit(XPT_BUSY, &xprt->xpt_flags);
        svc_xprt_enqueue(xprt);
+       svc_xprt_put(xprt);
 }
 EXPORT_SYMBOL_GPL(svc_xprt_received);