batman-adv: directly write tt entries without buffering
When the translation tables (global and local) are written for debugfs,
it is not neccesary to allocate a buffer, we can directly use
seq_printf() to print them out.
This might actually be safer if the table changes between size
calculation and traversal, and we can't estimate the required size
wrong.
Signed-off-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de>
Signed-off-by: Sven Eckelmann <sven@narfation.org>
diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c
index 5f28a7f0..78b9528 100644
--- a/net/batman-adv/translation-table.c
+++ b/net/batman-adv/translation-table.c
@@ -314,8 +314,6 @@
struct hard_iface *primary_if;
struct hlist_node *node;
struct hlist_head *head;
- size_t buf_size, pos;
- char *buff;
uint32_t i;
int ret = 0;
@@ -338,34 +336,13 @@
"announced via TT (TTVN: %u):\n",
net_dev->name, (uint8_t)atomic_read(&bat_priv->ttvn));
- buf_size = 1;
- /* Estimate length for: " * xx:xx:xx:xx:xx:xx\n" */
- for (i = 0; i < hash->size; i++) {
- head = &hash->table[i];
-
- rcu_read_lock();
- __hlist_for_each_rcu(node, head)
- buf_size += 29;
- rcu_read_unlock();
- }
-
- buff = kmalloc(buf_size, GFP_ATOMIC);
- if (!buff) {
- ret = -ENOMEM;
- goto out;
- }
-
- buff[0] = '\0';
- pos = 0;
-
for (i = 0; i < hash->size; i++) {
head = &hash->table[i];
rcu_read_lock();
hlist_for_each_entry_rcu(tt_local_entry, node,
head, hash_entry) {
- pos += snprintf(buff + pos, 30, " * %pM "
- "[%c%c%c%c%c]\n",
+ seq_printf(seq, " * %pM [%c%c%c%c%c]\n",
tt_local_entry->addr,
(tt_local_entry->flags &
TT_CLIENT_ROAM ? 'R' : '.'),
@@ -380,9 +357,6 @@
}
rcu_read_unlock();
}
-
- seq_printf(seq, "%s", buff);
- kfree(buff);
out:
if (primary_if)
hardif_free_ref(primary_if);
@@ -591,8 +565,6 @@
struct hard_iface *primary_if;
struct hlist_node *node;
struct hlist_head *head;
- size_t buf_size, pos;
- char *buff;
uint32_t i;
int ret = 0;
@@ -617,35 +589,13 @@
seq_printf(seq, " %-13s %s %-15s %s %s\n",
"Client", "(TTVN)", "Originator", "(Curr TTVN)", "Flags");
- buf_size = 1;
- /* Estimate length for: " * xx:xx:xx:xx:xx:xx (ttvn) via
- * xx:xx:xx:xx:xx:xx (cur_ttvn)\n"*/
- for (i = 0; i < hash->size; i++) {
- head = &hash->table[i];
-
- rcu_read_lock();
- __hlist_for_each_rcu(node, head)
- buf_size += 67;
- rcu_read_unlock();
- }
-
- buff = kmalloc(buf_size, GFP_ATOMIC);
- if (!buff) {
- ret = -ENOMEM;
- goto out;
- }
-
- buff[0] = '\0';
- pos = 0;
-
for (i = 0; i < hash->size; i++) {
head = &hash->table[i];
rcu_read_lock();
hlist_for_each_entry_rcu(tt_global_entry, node,
head, hash_entry) {
- pos += snprintf(buff + pos, 69,
- " * %pM (%3u) via %pM (%3u) "
+ seq_printf(seq, " * %pM (%3u) via %pM (%3u) "
"[%c%c%c]\n", tt_global_entry->addr,
tt_global_entry->ttvn,
tt_global_entry->orig_node->orig,
@@ -661,9 +611,6 @@
}
rcu_read_unlock();
}
-
- seq_printf(seq, "%s", buff);
- kfree(buff);
out:
if (primary_if)
hardif_free_ref(primary_if);