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authorFlorian Westphal <fw@strlen.de>2018-12-28 01:24:46 +0100
committerPablo Neira Ayuso <pablo@netfilter.org>2018-12-29 02:45:20 +0100
commitdf4a902509766897f7371fdfa4c3bf8bc321b55d (patch)
treed1c36526cc52fceae52d46a0eb5b5a3c7ffbf2de /drivers/ptp
parente8cfb372b38a1b8979aa7f7631fb5e7b11c3793c (diff)
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netfilter: nf_conncount: merge lookup and add functions
'lookup' is always followed by 'add'. Merge both and make the list-walk part of nf_conncount_add(). This also avoids one unneeded unlock/re-lock pair. Extra care needs to be taken in count_tree, as we only hold rcu read lock, i.e. we can only insert to an existing tree node after acquiring its lock and making sure it has a nonzero count. As a zero count should be rare, just fall back to insert_tree() (which acquires tree lock). This issue and its solution were pointed out by Shawn Bohrer during patch review. Reviewed-by: Shawn Bohrer <sbohrer@cloudflare.com> Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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