linux-kernel - Re: [PATCH 2/4] of: irq: Add support for the new definition of "msi-parent"

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Date:	Sun, 27 Sep 2015 16:02:40 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Marc Zyngier <marc.zyngier@....com>, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Mark Rutland <Mark.Rutland@....com>,
	Rob Herring <robh+dt@...nel.org>,
	Jason Cooper <jason@...edaemon.net>
Subject: Re: [PATCH 2/4] of: irq: Add support for the new definition of
 "msi-parent"

Hello.

On 9/27/2015 1:29 PM, Thomas Gleixner wrote:

>>> -	d = irq_find_matching_host(msi_np, DOMAIN_BUS_PLATFORM_MSI);
>>> -	if (!d)
>>> -		d = irq_find_host(msi_np);
>>> -	dev_set_msi_domain(dev, d);
>>> +		d = irq_find_matching_host(args.np, DOMAIN_BUS_PLATFORM_MSI);
>>> +		if (!d)
>>
>> 		if (!d) {
>>
>>> +			d = irq_find_host(args.np);
>>> +
>>> +		if (d) {
>>
>> 		} else {
>>
>>> +			dev_set_msi_domain(dev, d);
>>> +			return;
>>> +		}
>
> Errm, no. How is that equivalent?
>
> Marc:
>
>        d = foo();
>        if (!d)
>        	 d = bar();
>        if (d) {
>           bla(d);
> 	 return;
>        }
>
> Yours:
>
>        d = foo();
>        if (!d) {
>        	 d = bar();
>        } else {
>           bla(d);
> 	 return;
>        }
>
> Hmm?

    Ah, sorry, didn't notice the kind of assignment in the first branch. :-<

> Thanks,
> 	tglx

MBR, Sergei

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