From 8fa1d7d3b2c51594c0f3aa151983dd51f605e07d Mon Sep 17 00:00:00 2001 From: Satoru Takeuchi Date: Sat, 28 Oct 2006 10:38:57 -0700 Subject: [PATCH] [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 Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- kernel/cpu.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/kernel/cpu.c b/kernel/cpu.c index 27dd3ee4709..663c920b223 100644 --- a/kernel/cpu.c +++ b/kernel/cpu.c @@ -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)) -- 2.41.1