linux-kernel - Re: [PATCH] ata: pata_mpc52xx: Replace NO

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Date:   Thu, 6 Oct 2022 08:19:08 +0000
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Damien Le Moal <damien.lemoal@...nsource.wdc.com>,
        Sergey Shtylyov <s.shtylyov@....ru>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-ide@...r.kernel.org" <linux-ide@...r.kernel.org>
Subject: Re: [PATCH] ata: pata_mpc52xx: Replace NO_IRQ by 0



Le 06/10/2022 à 08:30, Damien Le Moal a écrit :
> On 10/6/22 14:49, Christophe Leroy wrote:
>>
>>
>> Le 06/10/2022 à 07:45, Damien Le Moal a écrit :
>>> On 10/6/22 14:17, Christophe Leroy wrote:
>>>> 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>
>>>
>>> Doesn't this need fixes and cc:stable tags ?
>>
>> I don't think so, because the only user of this driver is powerpc and
>> powerpc has NO_IRQ set to 0.
>>
>> I'm sending this because I was to remove NO_IRQ in powerpc in a second step.
> 
> OK. Got it. So queuing this for 6.2 is OK ? Or do you prefer seeing this
> as a "fix" in 6.1 ?

Yes 6.2 is fine.

Thanks
Christophe


> 
>>
>>>
>>>> ---
>>>>    drivers/ata/pata_mpc52xx.c | 2 +-
>>>>    1 file changed, 1 insertion(+), 1 deletion(-)
>>>>
>>>> diff --git a/drivers/ata/pata_mpc52xx.c b/drivers/ata/pata_mpc52xx.c
>>>> index 6559b606736d..3ebd6522a1fd 100644
>>>> --- a/drivers/ata/pata_mpc52xx.c
>>>> +++ b/drivers/ata/pata_mpc52xx.c
>>>> @@ -731,7 +731,7 @@ static int mpc52xx_ata_probe(struct platform_device *op)
>>>>    		udma_mask = ATA_UDMA2 & ((1 << (*prop + 1)) - 1);
>>>>    
>>>>    	ata_irq = irq_of_parse_and_map(op->dev.of_node, 0);
>>>> -	if (ata_irq == NO_IRQ) {
>>>> +	if (!ata_irq) {
>>>>    		dev_err(&op->dev, "error mapping irq\n");
>>>>    		return -EINVAL;
>>>>    	}
>