skb_share_check — check if buffer is shared and if so clone it
struct sk_buff * skb_share_check ( | struct sk_buff * skb, |
gfp_t pri); |
If the buffer is shared the buffer is cloned and the old copy drops a reference. A new clone with a single reference is returned. If the buffer is not shared the original buffer is returned. When being called from interrupt status or with spinlocks held pri must be GFP_ATOMIC.
NULL is returned on a memory allocation failure.