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linux-sg2042
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[PATCH] cpu-hotplug: release `workqueue_mutex' properly on CPU hot-remove 

_cpu_down() acquires `workqueue_mutex' on its process, but doen't release it
if __cpu_disable() fails.

Signed-off-by: Satoru Takeuchi <takeuchi_satoru@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Satoru Takeuchi 2006-10-28 10:38:57 -07:00 committed by Linus Torvalds
parent bb1d860551
commit 8fa1d7d3b2
1 changed files with 6 additions and 6 deletions
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12
kernel/cpu.c
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@ -150,18 +150,18 @@ static int _cpu_down(unsigned int cpu)
p = __stop_machine_run(take_cpu_down, NULL, cpu);
mutex_unlock(&cpu_bitmask_lock);
if (IS_ERR(p)) {
if (IS_ERR(p) || cpu_online(cpu)) {
/* CPU didn't die: tell everyone. Can't complain. */
if (raw_notifier_call_chain(&cpu_chain, CPU_DOWN_FAILED,
(void *)(long)cpu) == NOTIFY_BAD)
BUG();
err = PTR_ERR(p);
goto out_allowed;
}
if (cpu_online(cpu))
if (IS_ERR(p)) {
err = PTR_ERR(p);
goto out_allowed;
}
goto out_thread;
}
/* Wait for it to sleep (leaving idle task). */
while (!idle_cpu(cpu))