From: Peter Zijlstra <a.p.zijlstra@chello.nl>
Date: Mon, 5 Jan 2009 10:28:22 +0000 (+0100)
Subject: hrtimer: fix recursion deadlock by re-introducing the softirq
X-Git-Tag: v2.6.29-rc1~223^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a6037b61c2f5fc99c57c15b26d7cfa58bbb34008;p=pandora-kernel.git

hrtimer: fix recursion deadlock by re-introducing the softirq

Impact: fix rare runtime deadlock

There are a few sites that do:

  spin_lock_irq(&foo)
  hrtimer_start(&bar)
    __run_hrtimer(&bar)
      func()
        spin_lock(&foo)

which obviously deadlocks. In order to avoid this, never call __run_hrtimer()
from hrtimer_start*() context, but instead defer this to softirq context.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

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