linux-kernel - Re: [PATCH RESEND] iwlwifi, Do not implement thermal zone unless ucode is loaded

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Date:	Wed, 13 Jul 2016 09:50:53 +0300
From:	Kalle Valo <kvalo@...eaurora.org>
To:	Prarit Bhargava <prarit@...hat.com>
Cc:	"Grumbach\, Emmanuel" <emmanuel.grumbach@...el.com>,
	"linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
	linuxwifi <linuxwifi@...el.com>,
	"Coelho\, Luciano" <luciano.coelho@...el.com>,
	"Berg\, Johannes" <johannes.berg@...el.com>,
	"Ivgi\, Chaya Rachel" <chaya.rachel.ivgi@...el.com>,
	"netdev\@vger.kernel.org" <netdev@...r.kernel.org>,
	"Sharon\, Sara" <sara.sharon@...el.com>,
	"linux-wireless\@vger.kernel.org" <linux-wireless@...r.kernel.org>
Subject: Re: [PATCH RESEND] iwlwifi, Do not implement thermal zone unless ucode is loaded

Prarit Bhargava <prarit@...hat.com> writes:

>> We implement thermal zone because we do support it, but the problem is
>> that we need the firmware to be loaded for that. So you can argue that
>> we should register *later* when the firmware is loaded. But this is
>> really not helping all that much because the firmware can also be
>> stopped at any time. So you'd want us to register / unregister the
>> thermal zone anytime the firmware is loaded / unloaded?
>
> You might have to do that.  I think that if the firmware enables a feature then
> the act of loading the firmware should run the code that enables the feature.
> IMO of course.

But I suspect that the iwlwifi firmware is loaded during interface up
(and unloaded during interface down) and in that case
register/unregister would be happening all the time. That doesn't sound
like a good idea. I would rather try to fix the thermal interface to
handle the cases when the measurement is not available.

-- 
Kalle Valo