linux-kernel - Re: [PATCH] usb: Replace NO

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Date:   Thu, 6 Oct 2022 14:05:08 +0000
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Alan Stern <stern@...land.harvard.edu>
CC:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>
Subject: Re: [PATCH] usb: Replace NO_IRQ by 0



Le 06/10/2022 à 15:50, Alan Stern a écrit :
> On Thu, Oct 06, 2022 at 07:15:44AM +0200, Christophe Leroy wrote:
>> diff --git a/drivers/usb/host/ehci-grlib.c b/drivers/usb/host/ehci-grlib.c
>> index a2c3b4ec8a8b..0717f2ccf49d 100644
>> --- a/drivers/usb/host/ehci-grlib.c
>> +++ b/drivers/usb/host/ehci-grlib.c
>> @@ -99,7 +99,7 @@ static int ehci_hcd_grlib_probe(struct platform_device *op)
>>   	hcd->rsrc_len = resource_size(&res);
>>   
>>   	irq = irq_of_parse_and_map(dn, 0);
>> -	if (irq == NO_IRQ) {
>> +	if (!irq) {
>>   		dev_err(&op->dev, "%s: irq_of_parse_and_map failed\n",
>>   			__FILE__);
>>   		rv = -EBUSY;
> 
> Since NO_IRQ is sometimes set to -1, shouldn't this test (and all the
> other ones you changed) really be doing:
> 
> 	if (!irq || irq == NO_IRQ) { ...
> 

No, because irq_of_parse_and_map() will never return -1 as an error. It 
will always be 0.

The below call gives no result.

	git grep -w NO_IRQ drivers/of/ include/