Reduce boilerplate code by using __seq_open_private() instead of seq_open()
in xt_match_open() and xt_target_open().
Signed-off-by: Rob Jones <rob.jo...@codethink.co.uk>
---
This patch uses an existing variant of seq_open() to reduce the kernel code
size.
The only significant variation from the pre-existing code is the fact that
__seq_open_private() calls kzalloc() rather than kmalloc(), which could
conceivably have an impact on timing.
net/netfilter/x_tables.c | 30 ++++--------------------------
1 file changed, 4 insertions(+), 26 deletions(-)
diff --git a/net/netfilter/x_tables.c b/net/netfilter/x_tables.c
index 227aa11..89aa680 100644
--- a/net/netfilter/x_tables.c
+++ b/net/netfilter/x_tables.c
@@ -1137,22 +1137,11 @@ static const struct seq_operations xt_match_seq_ops = {
static int xt_match_open(struct inode *inode, struct file *file)
{
- struct seq_file *seq;
struct nf_mttg_trav *trav;
- int ret;
-
- trav = kmalloc(sizeof(*trav), GFP_KERNEL);
- if (trav == NULL)
+ trav = __seq_open_private(file, &xt_match_seq_ops, sizeof(*trav));
+ if (!trav)
return -ENOMEM;
- ret = seq_open(file, &xt_match_seq_ops);
- if (ret < 0) {
- kfree(trav);
- return ret;
- }
-
- seq = file->private_data;
- seq->private = trav;
trav->nfproto = (unsigned long)PDE_DATA(inode);
return 0;
}
@@ -1201,22 +1190,11 @@ static const struct seq_operations xt_target_seq_ops = {
static int xt_target_open(struct inode *inode, struct file *file)
{
- struct seq_file *seq;
struct nf_mttg_trav *trav;
- int ret;
-
- trav = kmalloc(sizeof(*trav), GFP_KERNEL);
- if (trav == NULL)
+ trav = __seq_open_private(file, &xt_target_seq_ops, sizeof(*trav));
+ if (!trav)
return -ENOMEM;
- ret = seq_open(file, &xt_target_seq_ops);
- if (ret < 0) {
- kfree(trav);
- return ret;
- }
-
- seq = file->private_data;
- seq->private = trav;
trav->nfproto = (unsigned long)PDE_DATA(inode);
return 0;
}
--
1.7.10.4
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
