tree 215b28da3dc0fbbac8dd853501306f65b165a499
parent e3a57d18b06179d68fcf7a0a06ad844493c65e06
author Florian Westphal <fw@strlen.de> 1406213436 +0200
committer David S. Miller <davem@davemloft.net> 1406525676 -0700

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>