tree 8fed9deb6a4a0c1f52634ff0bd07fb6a0edb8dde
parent ce046c568cbfb4734583131086f88cfe993c01d0
author Herbert Xu <herbert@gondor.apana.org.au> 1427151197 +1100
committer David S. Miller <davem@davemloft.net> 1427163367 -0400

rhashtable: Fix sleeping inside RCU critical section in walk_stop

The commit 963ecbd41a1026d99ec7537c050867428c397b89 ("rhashtable:
Fix use-after-free in rhashtable_walk_stop") fixed a real bug
but created another one because we may end up sleeping inside an
RCU critical section.

This patch fixes it properly by replacing the mutex with a spin
lock that specifically protects the walker lists.

Reported-by: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>