[TCP]: Cleanup /proc/tcp[6] creation/removal.

Replace seq_open with seq_open_net and remove tcp_seq_release
completely.  seq_release_net will do this job just fine.

Signed-off-by: Denis V. Lunev <den@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index c50dd1793643ea16db263f2b33ec6301cf03dace..840346b390d738d4943df6a37fd783034fa37bf8 100644 (file)
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -2211,46 +2211,19 @@ static void tcp_seq_stop(struct seq_file *seq, void *v)
 static int tcp_seq_open(struct inode *inode, struct file *file)
 {
        struct tcp_seq_afinfo *afinfo = PDE(inode)->data;
-       struct seq_file *seq;
        struct tcp_iter_state *s;
-       struct net *net;
-       int rc;
+       int err;
 
        if (unlikely(afinfo == NULL))
                return -EINVAL;
 
-       s = kzalloc(sizeof(*s), GFP_KERNEL);
-       if (!s)
-               return -ENOMEM;
-
-       rc = -ENXIO;
-       net = get_proc_net(inode);
-       if (!net)
-               goto out_kfree;
+       err = seq_open_net(inode, file, &afinfo->seq_ops,
+                         sizeof(struct tcp_iter_state));
+       if (err < 0)
+               return err;
 
+       s = ((struct seq_file *)file->private_data)->private;
        s->family               = afinfo->family;
-       s->p.net                = net;
-
-       rc = seq_open(file, &afinfo->seq_ops);
-       if (rc)
-               goto out_put_net;
-       seq = file->private_data;
-       seq->private = s;
-out:
-       return rc;
-out_put_net:
-       put_net(net);
-out_kfree:
-       kfree(s);
-       goto out;
-}
-
-static int tcp_seq_release(struct inode *inode, struct file *file)
-{
-       struct seq_file *seq = file->private_data;
-
-       put_net(seq_file_net(seq));
-       seq_release_private(inode, file);
        return 0;
 }
 
@@ -2263,7 +2236,7 @@ int tcp_proc_register(struct net *net, struct tcp_seq_afinfo *afinfo)
        afinfo->seq_fops->open          = tcp_seq_open;
        afinfo->seq_fops->read          = seq_read;
        afinfo->seq_fops->llseek        = seq_lseek;
-       afinfo->seq_fops->release       = tcp_seq_release;
+       afinfo->seq_fops->release       = seq_release_net;
 
        afinfo->seq_ops.start           = tcp_seq_start;
        afinfo->seq_ops.next            = tcp_seq_next;