linux-kernel - Re: [PATCH] pda_power: ac

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Message-ID: <505BB1E6.3010502@yahoo.com>
Date:	Fri, 21 Sep 2012 01:16:38 +0100
From:	Paul Parsons <lost.distance@...oo.com>
To:	Anton Vorontsov <cbouatmailru@...il.com>
CC:	dwmw2@...radead.org, philipp.zabel@...il.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] pda_power: ac_draw used before set

Hello Anton,

On 20/09/12 22:32, Anton Vorontsov wrote:
> On Wed, Sep 19, 2012 at 06:36:19PM +0100, Paul Parsons wrote:
>> When I reboot my iPAQ hx4700 in its cradle, the battery will not begin
>> to charge even though the AC supply is connected. Charging will start
>> only after the PDA power driver is tickled by some other power event,
>> such as reseating the iPAQ in its cradle or connecting the USB cable.
>>
>> The problem lies in pda_power_probe(), where ac_draw is used by the call
>> to update_charger() before being set by the call to regulator_get().
>>
>> Moving the regulator_get() call to before the update_charger() call
>> fixes the problem.
>>
>> Signed-off-by: Paul Parsons <lost.distance@...oo.com>
>> Cc: Philipp Zabel <philipp.zabel@...il.com>
>> ---
>
> Great to see that someone is still using hx4700. :-)
>
> Thanks for the patch, it is merged now!

I am having second thoughts about the goto ac_draw_failed I added.
This will cause pda_power_probe() to fail if regulator_get() fails.
However the way ac_draw is used - always after a check for NULL -
suggests that a failed call to regulator_get() was not fatal.

I am happy to submit another patch to remove the goto and label.

Regards,
Paul
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