diff options
Diffstat (limited to 'net/core/skbuff.c')
| -rw-r--r-- | net/core/skbuff.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/net/core/skbuff.c b/net/core/skbuff.c index e5e2111a397..6acbf9e79eb 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -65,6 +65,7 @@ #include <asm/uaccess.h> #include <asm/system.h> +#include <trace/skb.h> #include "kmap_skb.h" @@ -442,11 +443,32 @@ void kfree_skb(struct sk_buff *skb) smp_rmb(); else if (likely(!atomic_dec_and_test(&skb->users))) return; + trace_kfree_skb(skb, __builtin_return_address(0)); __kfree_skb(skb); } EXPORT_SYMBOL(kfree_skb); /** + * consume_skb - free an skbuff + * @skb: buffer to free + * + * Drop a ref to the buffer and free it if the usage count has hit zero + * Functions identically to kfree_skb, but kfree_skb assumes that the frame + * is being dropped after a failure and notes that + */ +void consume_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); +} +EXPORT_SYMBOL(consume_skb); + +/** * skb_recycle_check - check if skb can be reused for receive * @skb: buffer * @skb_size: minimum receive buffer size |