diff options
Diffstat (limited to 'net/core/skbuff.c')
| -rw-r--r-- | net/core/skbuff.c | 30 |
1 files changed, 29 insertions, 1 deletions
diff --git a/net/core/skbuff.c b/net/core/skbuff.c index a92d9e7d10f..898cf5c566f 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -179,6 +179,33 @@ out: * */ +struct sk_buff *__alloc_skb_head(gfp_t gfp_mask, int node) +{ + struct sk_buff *skb; + + /* Get the HEAD */ + skb = kmem_cache_alloc_node(skbuff_head_cache, + gfp_mask & ~__GFP_DMA, node); + if (!skb) + goto out; + + /* + * Only clear those fields we need to clear, not those that we will + * actually initialise below. Hence, don't put any more fields after + * the tail pointer in struct sk_buff! + */ + memset(skb, 0, offsetof(struct sk_buff, tail)); + skb->data = NULL; + skb->truesize = sizeof(struct sk_buff); + atomic_set(&skb->users, 1); + +#ifdef NET_SKBUFF_DATA_USES_OFFSET + skb->mac_header = ~0U; +#endif +out: + return skb; +} + /** * __alloc_skb - allocate a network buffer * @size: size to allocate @@ -584,7 +611,8 @@ static void skb_release_head_state(struct sk_buff *skb) static void skb_release_all(struct sk_buff *skb) { skb_release_head_state(skb); - skb_release_data(skb); + if (likely(skb->data)) + skb_release_data(skb); } /** |