Merge tag 'stable/for-linus-3.4-rc4-tag' of git://git.kernel.org/pub/scm/linux/kernel...

[mv-sheeva.git] / net / core / dev.c

diff --git a/net/core/dev.c b/net/core/dev.c
index 6c7dc9d78e10e1de7f9b706077cd13fc060cd811..9bb8f87c4cdad35481e6fc2389090d32a6d5b917 100644 (file)
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1409,14 +1409,34 @@ EXPORT_SYMBOL(register_netdevice_notifier);
  *     register_netdevice_notifier(). The notifier is unlinked into the
  *     kernel structures and may then be reused. A negative errno code
  *     is returned on a failure.
+ *
+ *     After unregistering unregister and down device events are synthesized
+ *     for all devices on the device list to the removed notifier to remove
+ *     the need for special case cleanup code.
  */
 
 int unregister_netdevice_notifier(struct notifier_block *nb)
 {
+       struct net_device *dev;
+       struct net *net;
        int err;
 
        rtnl_lock();
        err = raw_notifier_chain_unregister(&netdev_chain, nb);
+       if (err)
+               goto unlock;
+
+       for_each_net(net) {
+               for_each_netdev(net, dev) {
+                       if (dev->flags & IFF_UP) {
+                               nb->notifier_call(nb, NETDEV_GOING_DOWN, dev);
+                               nb->notifier_call(nb, NETDEV_DOWN, dev);
+                       }
+                       nb->notifier_call(nb, NETDEV_UNREGISTER, dev);
+                       nb->notifier_call(nb, NETDEV_UNREGISTER_BATCH, dev);
+               }
+       }
+unlock:
        rtnl_unlock();
        return err;
 }
@@ -4028,54 +4048,41 @@ static int dev_ifconf(struct net *net, char __user *arg)
 
 #ifdef CONFIG_PROC_FS
 
-#define BUCKET_SPACE (32 - NETDEV_HASHBITS)
-
-struct dev_iter_state {
-       struct seq_net_private p;
-       unsigned int pos; /* bucket << BUCKET_SPACE + offset */
-};
+#define BUCKET_SPACE (32 - NETDEV_HASHBITS - 1)
 
 #define get_bucket(x) ((x) >> BUCKET_SPACE)
 #define get_offset(x) ((x) & ((1 << BUCKET_SPACE) - 1))
 #define set_bucket_offset(b, o) ((b) << BUCKET_SPACE | (o))
 
-static inline struct net_device *dev_from_same_bucket(struct seq_file *seq)
+static inline struct net_device *dev_from_same_bucket(struct seq_file *seq, loff_t *pos)
 {
-       struct dev_iter_state *state = seq->private;
        struct net *net = seq_file_net(seq);
        struct net_device *dev;
        struct hlist_node *p;
        struct hlist_head *h;
-       unsigned int count, bucket, offset;
+       unsigned int count = 0, offset = get_offset(*pos);
 
-       bucket = get_bucket(state->pos);
-       offset = get_offset(state->pos);
-       h = &net->dev_name_head[bucket];
-       count = 0;
+       h = &net->dev_name_head[get_bucket(*pos)];
        hlist_for_each_entry_rcu(dev, p, h, name_hlist) {
-               if (count++ == offset) {
-                       state->pos = set_bucket_offset(bucket, count);
+               if (++count == offset)
                        return dev;
-               }
        }
 
        return NULL;
 }
 
-static inline struct net_device *dev_from_new_bucket(struct seq_file *seq)
+static inline struct net_device *dev_from_bucket(struct seq_file *seq, loff_t *pos)
 {
-       struct dev_iter_state *state = seq->private;
        struct net_device *dev;
        unsigned int bucket;
 
-       bucket = get_bucket(state->pos);
        do {
-               dev = dev_from_same_bucket(seq);
+               dev = dev_from_same_bucket(seq, pos);
                if (dev)
                        return dev;
 
-               bucket++;
-               state->pos = set_bucket_offset(bucket, 0);
+               bucket = get_bucket(*pos) + 1;
+               *pos = set_bucket_offset(bucket, 1);
        } while (bucket < NETDEV_HASHENTRIES);
 
        return NULL;
@@ -4088,33 +4095,20 @@ static inline struct net_device *dev_from_new_bucket(struct seq_file *seq)
 void *dev_seq_start(struct seq_file *seq, loff_t *pos)
        __acquires(RCU)
 {
-       struct dev_iter_state *state = seq->private;
-
        rcu_read_lock();
        if (!*pos)
                return SEQ_START_TOKEN;
 
-       /* check for end of the hash */
-       if (state->pos == 0 && *pos > 1)
+       if (get_bucket(*pos) >= NETDEV_HASHENTRIES)
                return NULL;
 
-       return dev_from_new_bucket(seq);
+       return dev_from_bucket(seq, pos);
 }
 
 void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 {
-       struct net_device *dev;
-
        ++*pos;
-
-       if (v == SEQ_START_TOKEN)
-               return dev_from_new_bucket(seq);
-
-       dev = dev_from_same_bucket(seq);
-       if (dev)
-               return dev;
-
-       return dev_from_new_bucket(seq);
+       return dev_from_bucket(seq, pos);
 }
 
 void dev_seq_stop(struct seq_file *seq, void *v)
@@ -4213,13 +4207,7 @@ static const struct seq_operations dev_seq_ops = {
 static int dev_seq_open(struct inode *inode, struct file *file)
 {
        return seq_open_net(inode, file, &dev_seq_ops,
-                           sizeof(struct dev_iter_state));
-}
-
-int dev_seq_open_ops(struct inode *inode, struct file *file,
-                    const struct seq_operations *ops)
-{
-       return seq_open_net(inode, file, ops, sizeof(struct dev_iter_state));
+                           sizeof(struct seq_net_private));
 }
 
 static const struct file_operations dev_seq_fops = {