netdev - Re: [PATCH] net: smc91x: propagate irq return code

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Message-ID: <87twls5fkk.fsf@belgarion.home>
Date:	Mon, 01 Feb 2016 21:41:15 +0100
From:	Robert Jarzmik <robert.jarzmik@...e.fr>
To:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Cc:	Nicolas Pitre <nico@...xnic.net>,
	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: smc91x: propagate irq return code

Sergei Shtylyov <sergei.shtylyov@...entembedded.com> writes:

> Hello.
>
> On 2/1/2016 1:46 AM, Robert Jarzmik wrote:
>
>> The smc91x driver doesn't honor the probe deferral mechanism when the
>> interrupt source is not yet available, such as one provided by a gpio
>> controller not probed.
>    What if 'ndev->irq' does equal 0?
That's not possible AFAIR.

There was a discussion where Linus had stated that the irq is a cookie, and a 0
value is "no interrupt", expcepting for the single case of a PC and its timer
interrupt.

As we're not in that case, and up to my understanding, platform_get_irq() cannot
return a 0 value, only a strictly negative or positive one.

And yet, that test now looks weird to me. I think I'll respin the patch with a
"if (ndev->irq < 0) {" instead of the "if (ndev->irq <= 0) {".

Cheers.

-- 
Robert