[NET]: Make core networking code use seq_open_private

This concerns the ipv4 and ipv6 code mostly, but also the netlink
and unix sockets.

The netlink code is an example of how to use the __seq_open_private()
call - it saves the net namespace on this private.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 17 deletions

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 307e1f1107ca..21b12de9e653 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -375,23 +375,8 @@ static const struct seq_operations rt_cache_seq_ops = {
 
 static int rt_cache_seq_open(struct inode *inode, struct file *file)
 {
-        struct seq_file *seq;
-        int rc = -ENOMEM;
-        struct rt_cache_iter_state *s;
-
-        s = kzalloc(sizeof(*s), GFP_KERNEL);
-        if (!s)
-                goto out;
-        rc = seq_open(file, &rt_cache_seq_ops);
-        if (rc)
-                goto out_kfree;
-        seq          = file->private_data;
-        seq->private = s;
-out:
-        return rc;
-out_kfree:
-        kfree(s);
-        goto out;
+        return seq_open_private(file, &rt_cache_seq_ops,
+                        sizeof(struct rt_cache_iter_state));
 }
 
 static const struct file_operations rt_cache_seq_fops = {