linux-kernel - Re: [PATCH] staging: comedi: ni_atmio: Handle return value of pnp

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Date:   Fri, 17 Nov 2017 12:06:07 +0530
From:   arvindY <arvind.yadav.cs@...il.com>
To:     Ian Abbott <abbotti@....co.uk>, hsweeten@...ionengravers.com,
        gregkh@...uxfoundation.org
Cc:     linux-kernel@...r.kernel.org, devel@...verdev.osuosl.org
Subject: Re: [PATCH] staging: comedi: ni_atmio: Handle return value of pnp_*

hi,

On Thursday 16 November 2017 07:27 PM, Ian Abbott wrote:
> On 16/11/17 04:32, Arvind Yadav wrote:
>> pnp_irq() and pnp_port_start() can fail here and we must check
>> its return value.
>>
>> Signed-off-by: Arvind Yadav <arvind.yadav.cs@...il.com>
>> ---
>>   drivers/staging/comedi/drivers/ni_atmio.c | 3 +++
>>   1 file changed, 3 insertions(+)
>>
>> diff --git a/drivers/staging/comedi/drivers/ni_atmio.c 
>> b/drivers/staging/comedi/drivers/ni_atmio.c
>> index 2d62a8c..dead159 100644
>> --- a/drivers/staging/comedi/drivers/ni_atmio.c
>> +++ b/drivers/staging/comedi/drivers/ni_atmio.c
>> @@ -308,6 +308,9 @@ static int ni_atmio_attach(struct comedi_device 
>> *dev,
>>             iobase = pnp_port_start(isapnp_dev, 0);
>>           irq = pnp_irq(isapnp_dev, 0);
>> +        if (irq == -1 || !iobase)
>> +            return -ENOMEM;
>> +
>>           comedi_set_hw_dev(dev, &isapnp_dev->dev);
>>       }
>>
>
> Can they fail here?  ni_isapnp_find_board() has already checked they 
> are valid.
Yes, you are right. It will not fail.

~arvind