diff options
| author | Paolo Abeni | 2017-06-12 11:23:41 +0200 |
|---|---|---|
| committer | David S. Miller | 2017-06-12 16:01:29 +0200 |
| commit | 3889a803e1da9bd7cd10d6504bf281ee7e55dfd6 (patch) | |
| tree | a02fdf7382352a186732bb51028ccebcdc2afde1 /include/linux/skbuff.h | |
| parent | sh_eth: add support for changing MTU (diff) | |
| download | kernel-qcow2-linux-3889a803e1da9bd7cd10d6504bf281ee7e55dfd6.tar.gz kernel-qcow2-linux-3889a803e1da9bd7cd10d6504bf281ee7e55dfd6.tar.xz kernel-qcow2-linux-3889a803e1da9bd7cd10d6504bf281ee7e55dfd6.zip | |
net: factor out a helper to decrement the skb refcount
The same code is replicated in 3 different places; move it to a
common helper.
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/skbuff.h')
| -rw-r--r-- | include/linux/skbuff.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index d460a4cbda1c..decce3655a48 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -867,6 +867,19 @@ static inline unsigned int skb_napi_id(const struct sk_buff *skb) #endif } +/* decrement the reference count and return true if we can free the skb */ +static inline bool skb_unref(struct sk_buff *skb) +{ + if (unlikely(!skb)) + return false; + if (likely(atomic_read(&skb->users) == 1)) + smp_rmb(); + else if (likely(!atomic_dec_and_test(&skb->users))) + return false; + + return true; +} + void kfree_skb(struct sk_buff *skb); void kfree_skb_list(struct sk_buff *segs); void skb_tx_error(struct sk_buff *skb); |