tree e275dc10e62e28ea8b7f4c25e6a30664974e233f
parent df8a39defad46b83694ea6dd868d332976d62cc0
author Thomas Graf <tgraf@suug.ch> 1421107101 +0000
committer David S. Miller <davem@davemloft.net> 1421212904 -0500

rhashtable: Lower/upper bucket may map to same lock while shrinking

Each per bucket lock covers a configurable number of buckets. While
shrinking, two buckets in the old table contain entries for a single
bucket in the new table. We need to lock down both while linking.
Check if they are protected by different locks to avoid a recursive
lock.

Fixes: 97defe1e ("rhashtable: Per bucket locks & deferred expansion/shrinking")
Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>