linux-kernel - Re: [RFC][PATCH] regulator: Fix _regulator_get_voltage if get

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Message-ID: <BANLkTinx-OPhDBVZFrz2V_o8-p4yfTt9Kg@mail.gmail.com>
Date:	Thu, 19 May 2011 17:58:06 +0800
From:	Axel Lin <axel.lin@...il.com>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	linux-kernel@...r.kernel.org, Liam Girdwood <lrg@...mlogic.co.uk>
Subject: Re: [RFC][PATCH] regulator: Fix _regulator_get_voltage if get_voltage
 callback is NULL

2011/5/19 Axel Lin <axel.lin@...il.com>:
> 2011/5/19 Mark Brown <broonie@...nsource.wolfsonmicro.com>:
>> On Wed, May 18, 2011 at 09:01:58PM +0800, Axel Lin wrote:
>>
>>> @@ -1886,13 +1886,15 @@ static int _regulator_get_voltage(struct regulator_dev *rdev)
>>>               if (sel < 0)
>>>                       return sel;
>>>               ret = rdev->desc->ops->list_voltage(rdev, sel);
>>> +             goto out;
>>>       }
>>
>> Why are you adding this goto?  It's not going to change anything...
>>
> no matter what ret value returns from rdev->desc->ops->list_voltage(rdev, sel);
>
> In the case of rdev->desc->ops->get_voltage is NULL,
> current implementation will always return -EINVAL;
>
hi Mark,
I'm thinking maybe you prefer changes like below:
How do you think?

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 9493f61..2a2e927 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -1887,12 +1887,12 @@ static int _regulator_get_voltage(struct
regulator_dev *rdev)
                        return sel;
                ret = rdev->desc->ops->list_voltage(rdev, sel);
        }
-       if (rdev->desc->ops->get_voltage)
+       else if (rdev->desc->ops->get_voltage)
                ret = rdev->desc->ops->get_voltage(rdev);
        else
                return -EINVAL;

-       return ret - rdev->constraints->uV_offset;
+       return ret < 0 ? ret : ret - rdev->constraints->uV_offset;
 }

 /**


Regards,
Axel
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