linux-kernel - Re: [PATCH] mtd: rawnand: mpc5121: Replace NO

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Date:   Thu, 6 Oct 2022 08:18:42 +0000
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Miquel Raynal <miquel.raynal@...tlin.com>
CC:     Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>
Subject: Re: [PATCH] mtd: rawnand: mpc5121: Replace NO_IRQ by 0

Hi Miquel

Le 06/10/2022 à 09:47, Miquel Raynal a écrit :
> Hi Christophe,
> 
> christophe.leroy@...roup.eu wrote on Thu,  6 Oct 2022 07:29:12 +0200:
> 
>> NO_IRQ is used to check the return of irq_of_parse_and_map().
>>
>> On some architecture NO_IRQ is 0, on other architectures it is -1.
>>
>> irq_of_parse_and_map() returns 0 on error, independent of NO_IRQ.
>>
>> So use 0 instead of using NO_IRQ.
>>
>> Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
> 
> Deserves Fixes and Cc:stable tags, isn't it?

I don't think so, because the only user today is powerpc which defines 
NO_IRQ as 0.

In the stable-kernel-rules.rst it is said:

  - It must fix a real bug that bothers people (not a, "This could be a
    problem..." type thing).


> 
>> ---
>>   drivers/mtd/nand/raw/mpc5121_nfc.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/mtd/nand/raw/mpc5121_nfc.c b/drivers/mtd/nand/raw/mpc5121_nfc.c
>> index 800d774aed8e..f68349cb7824 100644
>> --- a/drivers/mtd/nand/raw/mpc5121_nfc.c
>> +++ b/drivers/mtd/nand/raw/mpc5121_nfc.c
>> @@ -663,7 +663,7 @@ static int mpc5121_nfc_probe(struct platform_device *op)
>>   	}
>>   
>>   	prv->irq = irq_of_parse_and_map(dn, 0);
>> -	if (prv->irq == NO_IRQ) {
>> +	if (!prv->irq) {
>>   		dev_err(dev, "Error mapping IRQ!\n");
>>   		return -EINVAL;
>>   	}
> 
> 
> Thanks,
> Miquèl