Releasing `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@xxxxxxxxxxxxxx> Index: linux-2.6.19-rc3/kernel/cpu.c =================================================================== --- linux-2.6.19-rc3.orig/kernel/cpu.c 2006-10-24 14:01:39.000000000 +0900 +++ linux-2.6.19-rc3/kernel/cpu.c 2006-10-27 19:38:14.000000000 +0900 @@ -150,18 +150,18 @@ 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)) - To unsubscribe from this list: send the line "unsubscribe linux-ia64" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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