From: Heiko Carstens <heiko.carstens@de.ibm.com>
Date: Mon, 28 Apr 2008 09:33:07 +0000 (+0200)
Subject: sched: fix missing locking in sched_domains code
X-Git-Tag: v2.6.26-rc2~62^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=712555ee4f873515612f89554ad1a3fda5fa887e;p=pandora-kernel.git

sched: fix missing locking in sched_domains code

Concurrent calls to detach_destroy_domains and arch_init_sched_domains
were prevented by the old scheduler subsystem cpu hotplug mutex. When
this got converted to get_online_cpus() the locking got broken.
Unlike before now several processes can concurrently enter the critical
sections that were protected by the old lock.

So use the already present doms_cur_mutex to protect these sections again.

Cc: Gautham R Shenoy <ego@in.ibm.com>
Cc: Paul Jackson <pj@sgi.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

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