svc: Move create logic to common code

Move the svc transport list logic into common transport creation code.
Refactor this code path to make the flow of control easier to read.

Move the setting and clearing of the BUSY_BIT during transport creation
to common code.

Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
Acked-by: Neil Brown <neilb@suse.de>
Reviewed-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Greg Banks <gnb@sgi.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>

1 files changed, 25 insertions, 18 deletions

diff --git a/net/sunrpc/svc_xprt.c b/net/sunrpc/svc_xprt.c
index eb650af50c49..271467c5138d 100644
--- a/net/sunrpc/svc_xprt.c
+++ b/net/sunrpc/svc_xprt.c
@@ -105,6 +105,7 @@ void svc_xprt_init(struct svc_xprt_class *xcl, struct svc_xprt *xprt,
         INIT_LIST_HEAD(&xprt->xpt_deferred);
         mutex_init(&xprt->xpt_mutex);
         spin_lock_init(&xprt->xpt_lock);
+        set_bit(XPT_BUSY, &xprt->xpt_flags);
 }
 EXPORT_SYMBOL_GPL(svc_xprt_init);
 
@@ -112,7 +113,6 @@ int svc_create_xprt(struct svc_serv *serv, char *xprt_name, unsigned short port,
                     int flags)
 {
         struct svc_xprt_class *xcl;
-        int ret = -ENOENT;
         struct sockaddr_in sin = {
                 .sin_family             = AF_INET,
                 .sin_addr.s_addr        = INADDR_ANY,
@@ -121,27 +121,34 @@ int svc_create_xprt(struct svc_serv *serv, char *xprt_name, unsigned short port,
         dprintk("svc: creating transport %s[%d]\n", xprt_name, port);
         spin_lock(&svc_xprt_class_lock);
         list_for_each_entry(xcl, &svc_xprt_class_list, xcl_list) {
-                if (strcmp(xprt_name, xcl->xcl_name) == 0) {
-                        spin_unlock(&svc_xprt_class_lock);
-                        if (try_module_get(xcl->xcl_owner)) {
-                                struct svc_xprt *newxprt;
-                                newxprt = xcl->xcl_ops->xpo_create
-                                        (serv,
-                                         (struct sockaddr *)&sin, sizeof(sin),
-                                         flags);
-                                if (IS_ERR(newxprt)) {
-                                        module_put(xcl->xcl_owner);
-                                        ret = PTR_ERR(newxprt);
-                                } else
-                                        ret = svc_xprt_local_port(newxprt);
-                        }
-                        goto out;
+                struct svc_xprt *newxprt;
+
+                if (strcmp(xprt_name, xcl->xcl_name))
+                        continue;
+
+                if (!try_module_get(xcl->xcl_owner))
+                        goto err;
+
+                spin_unlock(&svc_xprt_class_lock);
+                newxprt = xcl->xcl_ops->
+                        xpo_create(serv, (struct sockaddr *)&sin, sizeof(sin),
+                                   flags);
+                if (IS_ERR(newxprt)) {
+                        module_put(xcl->xcl_owner);
+                        return PTR_ERR(newxprt);
                 }
+
+                clear_bit(XPT_TEMP, &newxprt->xpt_flags);
+                spin_lock_bh(&serv->sv_lock);
+                list_add(&newxprt->xpt_list, &serv->sv_permsocks);
+                spin_unlock_bh(&serv->sv_lock);
+                clear_bit(XPT_BUSY, &newxprt->xpt_flags);
+                return svc_xprt_local_port(newxprt);
         }
+ err:
         spin_unlock(&svc_xprt_class_lock);
         dprintk("svc: transport %s not found\n", xprt_name);
- out:
-        return ret;
+        return -ENOENT;
 }
 EXPORT_SYMBOL_GPL(svc_create_xprt);