Messages in this thread | | | Date | Fri, 8 Feb 2008 11:39:27 -0800 | From | Greg KH <> | Subject | Re: [REGRESSION] kobject handling in cpufreq |
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On Sat, Feb 09, 2008 at 12:52:40AM +0530, Balaji Rao wrote: > 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@suse.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@gmail.com>
This looks correct to me, nice catch.
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
thanks,
greg k-h
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