linux-kernel - Kobject_uevent in cpufreq.c

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Message-ID: <4D68720C2E767A4AA6A8796D42C8EB59C8D667@BGSMSX101.gar.corp.intel.com>
Date:	Mon, 13 May 2013 11:31:57 +0000
From:	"R, Durgadoss" <durgadoss.r@...el.com>
To:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Linux PM list (linux-pm@...r.kernel.org)" <linux-pm@...r.kernel.org>
CC:	"Greg KH (gregkh@...uxfoundation.org)" <gregkh@...uxfoundation.org>,
	"Wysocki, Rafael J" <rafael.j.wysocki@...el.com>
Subject: Kobject_uevent in cpufreq.c

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.

Thanks,
Durga
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