linux-kernel - Re: [RFC PATCH V2 1/8] irqdomain: Ensure type settings match for an existing mapping

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Date:	Tue, 22 Dec 2015 10:58:24 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Jon Hunter <jonathanh@...dia.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Jason Cooper <jason@...edaemon.net>,
	Marc Zyngier <marc.zyngier@....com>,
	Jiang Liu <jiang.liu@...ux.intel.com>,
	Stephen Warren <swarren@...dotorg.org>,
	Thierry Reding <thierry.reding@...il.com>,
	Kevin Hilman <khilman@...nel.org>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Grygorii Strashko <grygorii.strashko@...com>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Soren Brinkmann <soren.brinkmann@...inx.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>
Subject: Re: [RFC PATCH V2 1/8] irqdomain: Ensure type settings match for an
 existing mapping

On Fri, Dec 18, 2015 at 11:10 AM, Jon Hunter <jonathanh@...dia.com> wrote:
> On 17/12/15 13:16, Linus Walleij wrote:
>> On Thu, Dec 17, 2015 at 11:48 AM, Jon Hunter <jonathanh@...dia.com> wrote:
>>> +               } else {
>>> +                       virq = irq_domain_alloc_descs(-1, 1, hwirq,
>>> +                                                     of_node_to_nid(of_node));
>>
>> What is this all of a sudden? Not even mentioned in the
>> commit. Plus I bet ACPI need something else than OF nid
>> passed here.
>
> Do you mean the else part of all of the above?

Yes

> So in the current code, the else part calls irq_create_mapping() (...)

No, not that... The fact that you all of a sudden have started
calling irq_domain_alloc_descs() which the function didn't do
before, totally changing the calling semantics for everyone in
the kernel, leading to the problem I then describe with this
potentially being called before the irqdomain for the irqchip
is initialized and descs getting "random" numbers.

Yours,
Linus Walleij
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