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skb: Add skb_head_is_locked helper function

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This patch adds support for a skb_head_is_locked helper function.  It is
meant to be used any time we are considering transferring the head from
skb->head to a paged frag.  If the head is locked it means we cannot remove
the head from the skb so it must be copied or we must take the skb as a
whole.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexander Duyck 2012-05-03 01:09:42 +00:00 • committed by David S. Miller
parent 715dc1f342
commit 3a7c1ee4ab
3 changed files with 16 additions and 3 deletions
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2
net/ipv4/tcp_input.c
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@ -4568,7 +4568,7 @@ static bool tcp_try_coalesce(struct sock *sk,
skb_shinfo(from)->nr_frags >= MAX_SKB_FRAGS)
return false;
if (!from->head_frag || skb_cloned(from))
if (skb_head_is_locked(from))
return false;
delta = from->truesize - SKB_DATA_ALIGN(sizeof(struct sk_buff));