linux-kernel - Re: [PATCH 1/2] ASoC: tlv320adcx140: Avoid accessing invalid gpio

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Date:   Wed, 9 Sep 2020 12:08:24 +0200
From:   Camel Guo <camelg@...s.com>
To:     Peter Ujfalusi <peter.ujfalusi@...com>,
        Camel Guo <Camel.Guo@...s.com>,
        "lgirdwood@...il.com" <lgirdwood@...il.com>,
        "broonie@...nel.org" <broonie@...nel.org>,
        "tiwai@...e.com" <tiwai@...e.com>,
        "dmurphy@...com" <dmurphy@...com>
CC:     "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
        kernel <kernel@...s.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] ASoC: tlv320adcx140: Avoid accessing invalid
 gpio_reset

Hi Peter,

Thanks for your comment. I will make a new one like what you said.

On 9/8/20 2:03 PM, Peter Ujfalusi wrote:
> Hi,
> 
> On 08/09/2020 14.59, Peter Ujfalusi wrote:
>> 
>> 
>> On 08/09/2020 11.35, Camel Guo wrote:
>>> From: Camel Guo <camelg@...s.com>
>>>
>>> When gpio_reset is not well defined in devicetree, the
>>> adcx140->gpio_reset is an error code instead of NULL. In this case,
>>> adcx140->gpio_reset should not be used by adcx140_reset. This commit
>>> sets it NULL to avoid accessing an invalid variable.
>>>
>>> Signed-off-by: Camel Guo <camelg@...s.com>
>>> ---
>>>  sound/soc/codecs/tlv320adcx140.c | 4 +++-
>>>  1 file changed, 3 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/sound/soc/codecs/tlv320adcx140.c b/sound/soc/codecs/tlv320adcx140.c
>>> index 7ae6ec374be3..597dd1062943 100644
>>> --- a/sound/soc/codecs/tlv320adcx140.c
>>> +++ b/sound/soc/codecs/tlv320adcx140.c
>>> @@ -984,8 +984,10 @@ static int adcx140_i2c_probe(struct i2c_client *i2c,
>>>  
>>>       adcx140->gpio_reset = devm_gpiod_get_optional(adcx140->dev,
>>>                                                     "reset", GPIOD_OUT_LOW);
>>> -    if (IS_ERR(adcx140->gpio_reset))
>>> +    if (IS_ERR(adcx140->gpio_reset) || adcx140->gpio_reset == NULL) {
>>>               dev_info(&i2c->dev, "Reset GPIO not defined\n");
>>> +            adcx140->gpio_reset = NULL;
>> 
>> the correct fix is to:
>>        dev_err(&i2c->dev, "Reset GPIO not defined\n");
> 
> no need to print, I think gpio core will do that.
> 
>>        return PTR_ERR(adcx140->gpio_reset);
>> 
>> If the reset GPIO is specified and you get error when requesting it as
>> optional, there is a reason for that.
>> For example deferred probing.

I agree! Please ignore this patch and I will make a new one like this.

>> 
>>> +    }
>>>  
>>>       adcx140->supply_areg = devm_regulator_get_optional(adcx140->dev,
>>>                                                          "areg");
>>>
>> 
>> - Péter
>> 
>> Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
>> Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki
>> 
> 
> - Péter
> 
> Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
> Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki
>