linux-kernel - Re: [PATCH] acerhdf: convert to dev_pm

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Message-ID: <9ea470500907280208v1d8140b5v9d7d7f09df8f060f@mail.gmail.com>
Date:	Tue, 28 Jul 2009 11:08:19 +0200
From:	Borislav Petkov <petkovbb@...glemail.com>
To:	Peter Feuerer <peter@...e.net>
Cc:	Dmitry Torokhov <dmitry.torokhov@...il.com>, lenb@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] acerhdf: convert to dev_pm_ops

Hi,

On Tue, Jul 28, 2009 at 9:25 AM, Peter Feuerer<peter@...e.net> wrote:

[..]

>>> Hmm, looking at the driver I think the only function that actually
>>> is needed is poweroff() that would turn the fan in automatic mode
>>> before shutting down. The driver does not perform any actions when
>>> resuming so why bother?
>>
>> Agreed.
>>
>> Also, the fan comes out of warm and cold reboot in mode AUTO and
>> when the driver is enabled, the fan is turned off on the next run of
>> thermal_zone_device_update() when the read out temperature is within
>> limits.
>>
>> Correct me if I'm wrong, but the only reason I see for setting the
>> fan to mode AUTO before suspending/hibernating/etc is if it is taking
>> a really long time to hibernate and write RAM image to disk and the
>> machine is getting hot during that process. Otherwise, we might just
>> as well do _nothing_ when suspending and remove all suspend/resume
>> functionality altogether, no?
>
> This is right, currently the only reason for calling the suspend /
> hibernate functions is to set the fan to auto to ensure it doesn't get
> too hot while the kernel prepares the machine to suspend / hibernate.
>
> I would like to keep the resume function too. It's a nice to see
> what's happening with verbose=1.

That's not a reason for keeping code in the kernel and raising bloat
levels unnecessarily. If the driver doesn't need to do anything on
resume, then no function is needed.

-- 
Regards/Gruss,
Boris
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