linux-kernel - Re: [PATCH] regulator: max8973: get rid of extra variable for gpio validity

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Date:	Thu, 9 Apr 2015 16:06:11 +0530
From:	Laxman Dewangan <ldewangan@...dia.com>
To:	Mark Brown <broonie@...nel.org>
CC:	<lgirdwood@...il.com>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] regulator: max8973: get rid of extra variable for gpio
 validity

On Wednesday 08 April 2015 08:12 PM, Mark Brown wrote:
> * PGP Signed by an unknown key
>
> On Wed, Apr 08, 2015 at 07:08:00PM +0530, Laxman Dewangan wrote:
>> To find that dvs-gpio is valid or not, gpio API gpio_is_valid()
>> can be directly used instead of intermediate variable.
>>
>> Removing the extra variable and using the gpio_is_valid().
> Are you sure that platform data using 0 as default/unset is still
> handled correctly after this?
>

This issue already exist and this patch will not handle this case 
because gpio_is_valid() return true for gpio 0 also.

I search the registration of this driver on linux-next and found that it 
is used from DT only. No one is registering this device from non-DT.

However, I can push another patch to fix the issue as if platform data 
is provided from non-DT and dvs_gpio is 0 then mark this as -EINVAL so 
that it will treat this as invalid gpio.
Still there will be issue if some platform have real GPIO number as 0 
and register from board files.

Does it make sense?

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