From: Thomas Graf <tgraf@suug.ch>
Date: Mon, 12 Jan 2015 23:58:21 +0000 (+0000)
Subject: rhashtable: Lower/upper bucket may map to same lock while shrinking
X-Git-Tag: omap-for-v4.1/prcm-dts-mfd-syscon-fix~134^2~224
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=80ca8c3a84c74a87977558861bb8eef650732912;p=pandora-kernel.git

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>
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