| commit | a6037b61c2f5fc99c57c15b26d7cfa58bbb34008 | [log] [tgz] |
|---|---|---|
| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | Mon Jan 05 11:28:22 2009 +0100 |
| committer | Ingo Molnar <mingo@elte.hu> | Mon Jan 05 13:14:33 2009 +0100 |
| tree | b076de5cc8a75e4227f96dda31a0daa6e895579b | |
| parent | 731a55ba0f17064f85903b7bf8e24849ec6cfa20 [diff] |
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>