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Date: Sat, 9 Feb 2008 00:52:40 +0530 From: Balaji Rao <balajirrao@...il.com> To: linux-kernel@...r.kernel.org Cc: gregkh@...e.de Subject: [REGRESSION] kobject handling in cpufreq Hi greg, I encountered a regression in linux-2.6.git which prevented the system from shutting down. I found that it was 'waiting_for_completion' on kobj_unregister.The same thing happened when I tried to take CPUs offline. git-bisect pointed me to this commit : commit c10997f6575f476ff38442fa18fd4a0d80345f9d Author: Greg Kroah-Hartman <gregkh@...e.de> Date: Thu Dec 20 08:13:05 2007 -0800 Kobject: convert drivers/* from kobject_unregister() to kobject_put() In the file drivers/cpufreq/cpufreq.c, you have not replaced one occurrence of kobject_unregister with kobject_put. Apparently its because of the kobject_put in the subsequent line. @@ -1030,8 +1030,6 @@ static int __cpufreq_remove_dev (struct sys_device * sys_dev) unlock_policy_rwsem_write(cpu); - kobject_unregister(&data->kobj); - kobject_put(&data->kobj); /* we need to make sure that the underlying kobj is actually Now, this can be fixed by adding another kobject_put. But having two kobject_puts in consequent lines tells us that there should be two references to the kobject at that point. So, I believe that it is safe to remove the kobject_get corresponding to the existing kobject_put to fix this. Signed-off-by: Balaji Rao <balajirrao@...il.com> diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 64926aa..2158786 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -1004,17 +1004,6 @@ static int __cpufreq_remove_dev (struct sys_device * sys_dev) unlock_policy_rwsem_write(cpu); return 0; } -#endif - - - if (!kobject_get(&data->kobj)) { - spin_unlock_irqrestore(&cpufreq_driver_lock, flags); - cpufreq_debug_enable_ratelimit(); - unlock_policy_rwsem_write(cpu); - return -EFAULT; - } - -#ifdef CONFIG_SMP #ifdef CONFIG_HOTPLUG_CPU cpufreq_cpu_governor[cpu] = data->governor; -- regards, balaji rao -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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