5 files changed, 53 insertions, 41 deletions

diff --git a/net/core/dev.c b/net/core/dev.c
index c7e305d13b71..9c58c1ec41a9 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2096,6 +2096,7 @@ int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
 {
         const struct net_device_ops *ops = dev->netdev_ops;
         int rc = NETDEV_TX_OK;
+        unsigned int skb_len;
 
         if (likely(!skb->next)) {
                 u32 features;
@@ -2146,8 +2147,9 @@ int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
                         }
                 }
 
+                skb_len = skb->len;
                 rc = ops->ndo_start_xmit(skb, dev);
-                trace_net_dev_xmit(skb, rc);
+                trace_net_dev_xmit(skb, rc, dev, skb_len);
                 if (rc == NETDEV_TX_OK)
                         txq_trans_update(txq);
                 return rc;
@@ -2167,8 +2169,9 @@ gso:
                 if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
                         skb_dst_drop(nskb);
 
+                skb_len = nskb->len;
                 rc = ops->ndo_start_xmit(nskb, dev);
-                trace_net_dev_xmit(nskb, rc);
+                trace_net_dev_xmit(nskb, rc, dev, skb_len);
                 if (unlikely(rc != NETDEV_TX_OK)) {
                         if (rc & ~NETDEV_TX_MASK)
                                 goto out_kfree_gso_skb;
@@ -3111,7 +3114,7 @@ static int __netif_receive_skb(struct sk_buff *skb)
 
         skb_reset_network_header(skb);
         skb_reset_transport_header(skb);
-        skb->mac_len = skb->network_header - skb->mac_header;
+        skb_reset_mac_len(skb);
 
         pt_prev = NULL;
 
@@ -6175,6 +6178,11 @@ static int dev_cpu_callback(struct notifier_block *nfb,
                 oldsd->output_queue = NULL;
                 oldsd->output_queue_tailp = &oldsd->output_queue;
         }
+        /* Append NAPI poll list from offline CPU. */
+        if (!list_empty(&oldsd->poll_list)) {
+                list_splice_init(&oldsd->poll_list, &sd->poll_list);
+                raise_softirq_irqoff(NET_RX_SOFTIRQ);
+        }
 
         raise_softirq_irqoff(NET_TX_SOFTIRQ);
         local_irq_enable();
@@ -6261,29 +6269,23 @@ err_name:
 /**
  *      netdev_drivername - network driver for the device
  *      @dev: network device
- *      @buffer: buffer for resulting name
- *      @len: size of buffer
  *
  *      Determine network driver for device.
  */
-char *netdev_drivername(const struct net_device *dev, char *buffer, int len)
+const char *netdev_drivername(const struct net_device *dev)
 {
         const struct device_driver *driver;
         const struct device *parent;
-
-        if (len <= 0 || !buffer)
-                return buffer;
-        buffer[0] = 0;
+        const char *empty = "";
 
         parent = dev->dev.parent;
-
         if (!parent)
-                return buffer;
+                return empty;
 
         driver = parent->driver;
         if (driver && driver->name)
-                strlcpy(buffer, driver->name, len);
-        return buffer;
+                return driver->name;
+        return empty;
 }
 
 static int __netdev_printk(const char *level, const struct net_device *dev,
diff --git a/net/core/dst.c b/net/core/dst.c
index 9ccca038444f..6135f3671692 100644
--- a/net/core/dst.c
+++ b/net/core/dst.c
@@ -190,7 +190,8 @@ void *dst_alloc(struct dst_ops *ops, struct net_device *dev,
         dst->lastuse = jiffies;
         dst->flags = flags;
         dst->next = NULL;
-        dst_entries_add(ops, 1);
+        if (!(flags & DST_NOCOUNT))
+                dst_entries_add(ops, 1);
         return dst;
 }
 EXPORT_SYMBOL(dst_alloc);
@@ -243,7 +244,8 @@ again:
                 neigh_release(neigh);
         }
 
-        dst_entries_add(dst->ops, -1);
+        if (!(dst->flags & DST_NOCOUNT))
+                dst_entries_add(dst->ops, -1);
 
         if (dst->ops->destroy)
                 dst->ops->destroy(dst);
diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c
index 11b98bc2aa8f..33d2a1fba131 100644
--- a/net/core/net-sysfs.c
+++ b/net/core/net-sysfs.c
@@ -1179,9 +1179,14 @@ static void remove_queue_kobjects(struct net_device *net)
 #endif
 }
 
-static const void *net_current_ns(void)
+static void *net_grab_current_ns(void)
 {
-        return current->nsproxy->net_ns;
+        struct net *ns = current->nsproxy->net_ns;
+#ifdef CONFIG_NET_NS
+        if (ns)
+                atomic_inc(&ns->passive);
+#endif
+        return ns;
 }
 
 static const void *net_initial_ns(void)
@@ -1196,22 +1201,13 @@ static const void *net_netlink_ns(struct sock *sk)
 
 struct kobj_ns_type_operations net_ns_type_operations = {
         .type = KOBJ_NS_TYPE_NET,
-        .current_ns = net_current_ns,
+        .grab_current_ns = net_grab_current_ns,
         .netlink_ns = net_netlink_ns,
         .initial_ns = net_initial_ns,
+        .drop_ns = net_drop_ns,
 };
 EXPORT_SYMBOL_GPL(net_ns_type_operations);
 
-static void net_kobj_ns_exit(struct net *net)
-{
-        kobj_ns_exit(KOBJ_NS_TYPE_NET, net);
-}
-
-static struct pernet_operations kobj_net_ops = {
-        .exit = net_kobj_ns_exit,
-};
-
-
 #ifdef CONFIG_HOTPLUG
 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
 {
@@ -1339,6 +1335,5 @@ EXPORT_SYMBOL(netdev_class_remove_file);
 int netdev_kobject_init(void)
 {
         kobj_ns_type_register(&net_ns_type_operations);
-        register_pernet_subsys(&kobj_net_ops);
         return class_register(&net_class);
 }
diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c
index 6c6b86d0da15..ea489db1bc23 100644
--- a/net/core/net_namespace.c
+++ b/net/core/net_namespace.c
@@ -128,6 +128,7 @@ static __net_init int setup_net(struct net *net)
         LIST_HEAD(net_exit_list);
 
         atomic_set(&net->count, 1);
+        atomic_set(&net->passive, 1);
 
 #ifdef NETNS_REFCNT_DEBUG
         atomic_set(&net->use_count, 0);
@@ -210,6 +211,13 @@ static void net_free(struct net *net)
         kmem_cache_free(net_cachep, net);
 }
 
+void net_drop_ns(void *p)
+{
+        struct net *ns = p;
+        if (ns && atomic_dec_and_test(&ns->passive))
+                net_free(ns);
+}
+
 struct net *copy_net_ns(unsigned long flags, struct net *old_net)
 {
         struct net *net;
@@ -230,7 +238,7 @@ struct net *copy_net_ns(unsigned long flags, struct net *old_net)
         }
         mutex_unlock(&net_mutex);
         if (rv < 0) {
-                net_free(net);
+                net_drop_ns(net);
                 return ERR_PTR(rv);
         }
         return net;
@@ -286,7 +294,7 @@ static void cleanup_net(struct work_struct *work)
         /* Finally it is safe to free my network namespace structure */
         list_for_each_entry_safe(net, tmp, &net_exit_list, exit_list) {
                 list_del_init(&net->exit_list);
-                net_free(net);
+                net_drop_ns(net);
         }
 }
 static DECLARE_WORK(net_cleanup_work, cleanup_net);
@@ -310,19 +318,17 @@ struct net *get_net_ns_by_fd(int fd)
         struct file *file;
         struct net *net;
 
-        net = ERR_PTR(-EINVAL);
         file = proc_ns_fget(fd);
-        if (!file)
-                goto out;
+        if (IS_ERR(file))
+                return ERR_CAST(file);
 
         ei = PROC_I(file->f_dentry->d_inode);
-        if (ei->ns_ops != &netns_operations)
-                goto out;
+        if (ei->ns_ops == &netns_operations)
+                net = get_net(ei->ns);
+        else
+                net = ERR_PTR(-EINVAL);
 
-        net = get_net(ei->ns);
-out:
-        if (file)
-                fput(file);
+        fput(file);
         return net;
 }
 
diff --git a/net/core/netpoll.c b/net/core/netpoll.c
index 2d7d6d473781..18d9cbda3a39 100644
--- a/net/core/netpoll.c
+++ b/net/core/netpoll.c
@@ -792,6 +792,13 @@ int netpoll_setup(struct netpoll *np)
                 return -ENODEV;
         }
 
+        if (ndev->master) {
+                printk(KERN_ERR "%s: %s is a slave device, aborting.\n",
+                       np->name, np->dev_name);
+                err = -EBUSY;
+                goto put;
+        }
+
         if (!netif_running(ndev)) {
                 unsigned long atmost, atleast;