[MTD][MTDPART] Fix a division by zero bug

[linux-2.6-omap-h63xx.git] / net / core / dev_mcast.c

diff --git a/net/core/dev_mcast.c b/net/core/dev_mcast.c
index 69fff16ece10c70c3c94d2624a2d1086a23e26a8..f8a3455f4493f7276fe614af6dbd7c26f4f04cb8 100644 (file)
--- a/net/core/dev_mcast.c
+++ b/net/core/dev_mcast.c
@@ -113,32 +113,15 @@ int dev_mc_add(struct net_device *dev, void *addr, int alen, int glbl)
  *     locked by netif_tx_lock_bh.
  *
  *     This function is intended to be called from the dev->set_multicast_list
- *     function of layered software devices.
+ *     or dev->set_rx_mode function of layered software devices.
  */
 int dev_mc_sync(struct net_device *to, struct net_device *from)
 {
-       struct dev_addr_list *da, *next;
        int err = 0;
 
        netif_tx_lock_bh(to);
-       da = from->mc_list;
-       while (da != NULL) {
-               next = da->next;
-               if (!da->da_synced) {
-                       err = __dev_addr_add(&to->mc_list, &to->mc_count,
-                                            da->da_addr, da->da_addrlen, 0);
-                       if (err < 0)
-                               break;
-                       da->da_synced = 1;
-                       da->da_users++;
-               } else if (da->da_users == 1) {
-                       __dev_addr_delete(&to->mc_list, &to->mc_count,
-                                         da->da_addr, da->da_addrlen, 0);
-                       __dev_addr_delete(&from->mc_list, &from->mc_count,
-                                         da->da_addr, da->da_addrlen, 0);
-               }
-               da = next;
-       }
+       err = __dev_addr_sync(&to->mc_list, &to->mc_count,
+                             &from->mc_list, &from->mc_count);
        if (!err)
                __dev_set_rx_mode(to);
        netif_tx_unlock_bh(to);
@@ -160,23 +143,11 @@ EXPORT_SYMBOL(dev_mc_sync);
  */
 void dev_mc_unsync(struct net_device *to, struct net_device *from)
 {
-       struct dev_addr_list *da, *next;
-
        netif_tx_lock_bh(from);
        netif_tx_lock_bh(to);
 
-       da = from->mc_list;
-       while (da != NULL) {
-               next = da->next;
-               if (da->da_synced) {
-                       __dev_addr_delete(&to->mc_list, &to->mc_count,
-                                         da->da_addr, da->da_addrlen, 0);
-                       da->da_synced = 0;
-                       __dev_addr_delete(&from->mc_list, &from->mc_count,
-                                         da->da_addr, da->da_addrlen, 0);
-               }
-               da = next;
-       }
+       __dev_addr_unsync(&to->mc_list, &to->mc_count,
+                         &from->mc_list, &from->mc_count);
        __dev_set_rx_mode(to);
 
        netif_tx_unlock_bh(to);
@@ -185,37 +156,14 @@ void dev_mc_unsync(struct net_device *to, struct net_device *from)
 EXPORT_SYMBOL(dev_mc_unsync);
 
 #ifdef CONFIG_PROC_FS
-static void *dev_mc_seq_start(struct seq_file *seq, loff_t *pos)
-{
-       struct net *net = seq->private;
-       struct net_device *dev;
-       loff_t off = 0;
-
-       read_lock(&dev_base_lock);
-       for_each_netdev(net, dev) {
-               if (off++ == *pos)
-                       return dev;
-       }
-       return NULL;
-}
-
-static void *dev_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
-{
-       ++*pos;
-       return next_net_device((struct net_device *)v);
-}
-
-static void dev_mc_seq_stop(struct seq_file *seq, void *v)
-{
-       read_unlock(&dev_base_lock);
-}
-
-
 static int dev_mc_seq_show(struct seq_file *seq, void *v)
 {
        struct dev_addr_list *m;
        struct net_device *dev = v;
 
+       if (v == SEQ_START_TOKEN)
+               return 0;
+
        netif_tx_lock_bh(dev);
        for (m = dev->mc_list; m; m = m->next) {
                int i;
@@ -233,34 +181,16 @@ static int dev_mc_seq_show(struct seq_file *seq, void *v)
 }
 
 static const struct seq_operations dev_mc_seq_ops = {
-       .start = dev_mc_seq_start,
-       .next  = dev_mc_seq_next,
-       .stop  = dev_mc_seq_stop,
+       .start = dev_seq_start,
+       .next  = dev_seq_next,
+       .stop  = dev_seq_stop,
        .show  = dev_mc_seq_show,
 };
 
 static int dev_mc_seq_open(struct inode *inode, struct file *file)
 {
-       struct seq_file *seq;
-       int res;
-       res = seq_open(file, &dev_mc_seq_ops);
-       if (!res) {
-               seq = file->private_data;
-               seq->private = get_proc_net(inode);
-               if (!seq->private) {
-                       seq_release(inode, file);
-                       res = -ENXIO;
-               }
-       }
-       return res;
-}
-
-static int dev_mc_seq_release(struct inode *inode, struct file *file)
-{
-       struct seq_file *seq = file->private_data;
-       struct net *net = seq->private;
-       put_net(net);
-       return seq_release(inode, file);
+       return seq_open_net(inode, file, &dev_mc_seq_ops,
+                           sizeof(struct seq_net_private));
 }
 
 static const struct file_operations dev_mc_seq_fops = {
@@ -268,7 +198,7 @@ static const struct file_operations dev_mc_seq_fops = {
        .open    = dev_mc_seq_open,
        .read    = seq_read,
        .llseek  = seq_lseek,
-       .release = dev_mc_seq_release,
+       .release = seq_release_net,
 };
 
 #endif