6lowpan: use stack buffer instead of heap

head buffer is only temporary available in lowpan_header_create.
So it's not necessary to put it on the heap.

Also fixed a comment codestyle issue.

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 9 deletions

diff --git a/net/ieee802154/6lowpan.c b/net/ieee802154/6lowpan.c
index f62c3b963f95..43b95ca61114 100644
--- a/net/ieee802154/6lowpan.c
+++ b/net/ieee802154/6lowpan.c
@@ -377,17 +377,14 @@ static int lowpan_header_create(struct sk_buff *skb,
         struct ipv6hdr *hdr;
         const u8 *saddr = _saddr;
         const u8 *daddr = _daddr;
-        u8 *head;
+        u8 head[100];
         struct ieee802154_addr sa, da;
 
+        /* TODO:
+         * if this package isn't ipv6 one, where should it be routed?
+         */
         if (type != ETH_P_IPV6)
                 return 0;
-                /* TODO:
-                 * if this package isn't ipv6 one, where should it be routed?
-                 */
-        head = kzalloc(100, GFP_KERNEL);
-        if (head == NULL)
-                return -ENOMEM;
 
         hdr = ipv6_hdr(skb);
         hc06_ptr = head + 2;
@@ -561,8 +558,6 @@ static int lowpan_header_create(struct sk_buff *skb,
         skb_pull(skb, sizeof(struct ipv6hdr));
         memcpy(skb_push(skb, hc06_ptr - head), head, hc06_ptr - head);
 
-        kfree(head);
-
         lowpan_raw_dump_table(__func__, "raw skb data dump", skb->data,
                                 skb->len);