linux-kernel - Re: Kobject_uevent in cpufreq.c

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Date:	Mon, 13 May 2013 04:58:01 -0700
From:	"Greg KH (gregkh@...uxfoundation.org)" <gregkh@...uxfoundation.org>
To:	"R, Durgadoss" <durgadoss.r@...el.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Linux PM list (linux-pm@...r.kernel.org)" <linux-pm@...r.kernel.org>,
	"Wysocki, Rafael J" <rafael.j.wysocki@...el.com>
Subject: Re: Kobject_uevent in cpufreq.c

On Mon, May 13, 2013 at 11:31:57AM +0000, R, Durgadoss wrote:
> Hi,
> 
> I am observing an UEvent issue in cpufreq.c. 
> The cpufreq_add_dev() function is called whenever a core is 'onlined'.
> we expect the kobject_uevent() method in cpufreq_add_dev() to
> send an UEvent with KOBJ_ADD as the action parameter.
> 
> But this call fails because of the 'filter function' inside kobject_uevent_env
> inside lib/kobject_uevent.c. The ->filter points to 'dev_uevent_filter' in
> drivers/base/core.c, where the check for 'device_ktype' fails.
> 
> Error message:
> kobject: 'cpufreq' (e5bbf290): kobject_uevent_env:
> filter function caused the event to drop!
> 
> As far as I can see, we need a kset, and associated filter function
> inside cpufreq.c to get this working. Is this the right way to go ?
> Any other easy/correct ways to get it working ? Please advise.

What exactly are you trying to do, and want the kernel to do?  You
already get on/offline events for CPUs, why do you want them for cpufreq
devices as well?

thanks,

greg k-h
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