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authorFlorian Westphal <fw@strlen.de>2014-07-24 16:50:36 +0200
committerDavid S. Miller <davem@davemloft.net>2014-07-28 07:34:36 +0200
commitab1c724f633080ed2e8a0cfe61654599b55cf8f9 (patch)
tree215b28da3dc0fbbac8dd853501306f65b165a499 /net/ieee802154
parentinet: frag: remove periodic secret rebuild timer (diff)
downloadlinux-ab1c724f633080ed2e8a0cfe61654599b55cf8f9.tar.xz
linux-ab1c724f633080ed2e8a0cfe61654599b55cf8f9.zip
inet: frag: use seqlock for hash rebuild
rehash is rare operation, don't force readers to take the read-side rwlock. Instead, we only have to detect the (rare) case where the secret was altered while we are trying to insert a new inetfrag queue into the table. If it was changed, drop the bucket lock and recompute the hash to get the 'new' chain bucket that we have to insert into. Joint work with Nikolay Aleksandrov. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Nikolay Aleksandrov <nikolay@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ieee802154')
-rw-r--r--net/ieee802154/reassembly.c1
1 files changed, 0 insertions, 1 deletions
diff --git a/net/ieee802154/reassembly.c b/net/ieee802154/reassembly.c
index 20d219682d84..8da635d92a58 100644
--- a/net/ieee802154/reassembly.c
+++ b/net/ieee802154/reassembly.c
@@ -124,7 +124,6 @@ fq_find(struct net *net, const struct lowpan_frag_info *frag_info,
arg.src = src;
arg.dst = dst;
- read_lock(&lowpan_frags.lock);
hash = lowpan_hash_frag(frag_info->d_tag, frag_info->d_size, src, dst);
q = inet_frag_find(&ieee802154_lowpan->frags,