wpan: use stack buffer instead of heap

head buffer is only temporary available in mac802154_header_create.
So it's not necessary to put it on the heap.

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

1 files changed, 1 insertions, 6 deletions

diff --git a/net/mac802154/wpan.c b/net/mac802154/wpan.c
index 98c867bca986..d20c6d3c247d 100644
--- a/net/mac802154/wpan.c
+++ b/net/mac802154/wpan.c
@@ -137,16 +137,12 @@ static int mac802154_header_create(struct sk_buff *skb,
         struct ieee802154_addr dev_addr;
         struct mac802154_sub_if_data *priv = netdev_priv(dev);
         int pos = 2;
-        u8 *head;
+        u8 head[MAC802154_FRAME_HARD_HEADER_LEN];
         u16 fc;
 
         if (!daddr)
                 return -EINVAL;
 
-        head = kzalloc(MAC802154_FRAME_HARD_HEADER_LEN, GFP_KERNEL);
-        if (head == NULL)
-                return -ENOMEM;
-
         head[pos++] = mac_cb(skb)->seq; /* DSN/BSN */
         fc = mac_cb_type(skb);
 
@@ -210,7 +206,6 @@ static int mac802154_header_create(struct sk_buff *skb,
         head[1] = fc >> 8;
 
         memcpy(skb_push(skb, pos), head, pos);
-        kfree(head);
 
         return pos;
 }