From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Thu, 2 Sep 2010 23:09:32 +0000 (+0000)
Subject: net: pskb_expand_head() optimization
X-Git-Tag: v2.6.37-rc1~147^2~544
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1fd63041c49c5c6ed1fe58b7bccc2de462d51e2b;p=pandora-kernel.git

net: pskb_expand_head() optimization

pskb_expand_head() blindly takes references on fragments before calling
skb_release_data(), potentially releasing these references.

We can add a fast path, avoiding these atomic operations, if we own the
last reference on skb->head.

Based on a previous patch from David

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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