linux-kernel - Re: [PATCH] mtd: onenand: Fix an error handling path in 's3c_onenand

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Date:   Fri, 8 Dec 2017 22:15:58 +0100
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     linux-kernel@...r.kernel.org
Cc:     linux-mtd@...ts.infradead.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] mtd: onenand: Fix an error handling path in
 's3c_onenand_probe(()'

Le 07/12/2017 à 17:55, Boris Brezillon a écrit :
> On Sat, 18 Nov 2017 14:27:23 +0100
> Christophe JAILLET <christophe.jaillet@...adoo.fr> wrote:
>
>> If 'platform_get_resource()' fails, we have to go through the error
>> handling path to release some resources.
>>
>> The unreachable 'goto ahb_resource_failed' is also wrong here and we should
>> go to 'resource_failed' instead.
>>
>> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
>> ---
>>   drivers/mtd/onenand/samsung.c | 4 ++--
>>   1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/mtd/onenand/samsung.c b/drivers/mtd/onenand/samsung.c
>> index af0ac1a7bf8f..164ebe2b1137 100644
>> --- a/drivers/mtd/onenand/samsung.c
>> +++ b/drivers/mtd/onenand/samsung.c
>> @@ -872,8 +872,8 @@ static int s3c_onenand_probe(struct platform_device *pdev)
>>   	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>>   	if (!r) {
>>   		dev_err(&pdev->dev, "no memory resource defined\n");
>> -		return -ENOENT;
>> -		goto ahb_resource_failed;
>> +		err = -ENOENT;
>> +		goto resource_failed;
>>   	}
>>   
> Sorry but I'd really prefer to convert the driver to use devm_
> functions instead of fixing a single error path.

Thanks for your comment. devm_ functions greatly simplify the code.
I've proposed an update for that.

If I'm correct, this also helped to find two other bugs (un-balanced 
request_irq() and un-handled error code)

CJ