diff options
Diffstat (limited to 'net/core/skbuff.c')
| -rw-r--r-- | net/core/skbuff.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/net/core/skbuff.c b/net/core/skbuff.c index 2144952d1c6..01abf1e8990 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -356,6 +356,24 @@ void __kfree_skb(struct sk_buff *skb) } /** + * kfree_skb - free an sk_buff + * @skb: buffer to free + * + * Drop a reference to the buffer and free it if the usage count has + * hit zero. + */ +void kfree_skb(struct sk_buff *skb) +{ + if (unlikely(!skb)) + return; + if (likely(atomic_read(&skb->users) == 1)) + smp_rmb(); + else if (likely(!atomic_dec_and_test(&skb->users))) + return; + __kfree_skb(skb); +} + +/** * skb_clone - duplicate an sk_buff * @skb: buffer to clone * @gfp_mask: allocation priority @@ -1799,6 +1817,7 @@ void __init skb_init(void) EXPORT_SYMBOL(___pskb_trim); EXPORT_SYMBOL(__kfree_skb); +EXPORT_SYMBOL(kfree_skb); EXPORT_SYMBOL(__pskb_pull_tail); EXPORT_SYMBOL(__alloc_skb); EXPORT_SYMBOL(pskb_copy); |