net: make the tcp and udp file_operations for the /proc stuff const

the tcp and udp code creates a set of struct file_operations at runtime
while it can also be done at compile time, with the added benefit of then
having these file operations be const.

the trickiest part was to get the "THIS_MODULE" reference right; the naive
method of declaring a struct in the place of registration would not work
for this reason.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 12 insertions, 10 deletions

diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index ebaa96bd3464..131d8a720086 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -2037,7 +2037,7 @@ static void udp_seq_stop(struct seq_file *seq, void *v)
                 spin_unlock_bh(&state->udp_table->hash[state->bucket].lock);
 }
 
-static int udp_seq_open(struct inode *inode, struct file *file)
+int udp_seq_open(struct inode *inode, struct file *file)
 {
         struct udp_seq_afinfo *afinfo = PDE(inode)->data;
         struct udp_iter_state *s;
@@ -2053,6 +2053,7 @@ static int udp_seq_open(struct inode *inode, struct file *file)
         s->udp_table            = afinfo->udp_table;
         return err;
 }
+EXPORT_SYMBOL(udp_seq_open);
 
 /* ------------------------------------------------------------------------ */
 int udp_proc_register(struct net *net, struct udp_seq_afinfo *afinfo)
@@ -2060,17 +2061,12 @@ int udp_proc_register(struct net *net, struct udp_seq_afinfo *afinfo)
         struct proc_dir_entry *p;
         int rc = 0;
 
-        afinfo->seq_fops.open           = udp_seq_open;
-        afinfo->seq_fops.read           = seq_read;
-        afinfo->seq_fops.llseek         = seq_lseek;
-        afinfo->seq_fops.release        = seq_release_net;
-
         afinfo->seq_ops.start           = udp_seq_start;
         afinfo->seq_ops.next            = udp_seq_next;
         afinfo->seq_ops.stop            = udp_seq_stop;
 
         p = proc_create_data(afinfo->name, S_IRUGO, net->proc_net,
-                             &afinfo->seq_fops, afinfo);
+                             afinfo->seq_fops, afinfo);
         if (!p)
                 rc = -ENOMEM;
         return rc;
@@ -2120,14 +2116,20 @@ int udp4_seq_show(struct seq_file *seq, void *v)
         return 0;
 }
 
+static const struct file_operations udp_afinfo_seq_fops = {
+        .owner    = THIS_MODULE,
+        .open     = udp_seq_open,
+        .read     = seq_read,
+        .llseek   = seq_lseek,
+        .release  = seq_release_net
+};
+
 /* ------------------------------------------------------------------------ */
 static struct udp_seq_afinfo udp4_seq_afinfo = {
         .name           = "udp",
         .family         = AF_INET,
         .udp_table      = &udp_table,
-        .seq_fops       = {
-                .owner  =       THIS_MODULE,
-        },
+        .seq_fops       = &udp_afinfo_seq_fops,
         .seq_ops        = {
                 .show           = udp4_seq_show,
         },