From: Thomas Gleixner <tglx@linutronix.de>
Date: Wed, 9 Dec 2009 08:32:03 +0000 (+0100)
Subject: sched: Protect sched_rr_get_param() access to task->sched_class
X-Git-Tag: v2.6.33-rc1~298^2~17
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=dba091b9e3522b9d32fc9975e48d3b69633b45f0;p=pandora-kernel.git

sched: Protect sched_rr_get_param() access to task->sched_class

sched_rr_get_param calls
task->sched_class->get_rr_interval(task) without protection
against a concurrent sched_setscheduler() call which modifies
task->sched_class.

Serialize the access with task_rq_lock(task) and hand the rq
pointer into get_rr_interval() as it's needed at least in the
sched_fair implementation.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra <peterz@infradead.org>
LKML-Reference: <alpine.LFD.2.00.0912090930120.3089@localhost.localdomain>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

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