linux-kernel - Re: [PATCH 00/15] arm/arm64: fix use of irq_find

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Message-ID: <87mwbskzna.fsf@approximate.cambridge.arm.com>
Date:	Tue, 29 Jul 2014 15:28:25 +0100
From:	Marc Zyngier <marc.zyngier@....com>
To:	Christopher Covington <cov@...eaurora.org>
Cc:	"linux-arm-kernel\@lists.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
	Mark Rutland <Mark.Rutland@....com>,
	Barry Song <baohua@...nel.org>,
	Kevin Hilman <khilman@...aro.org>,
	Russell King <linux@....linux.org.uk>,
	Jason Cooper <jason@...edaemon.net>,
	Alexander Shiyan <shc_work@...l.ru>,
	Larry Bassel <larry.bassel@...aro.org>,
	Catalin Marinas <Catalin.Marinas@....com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Will Deacon <Will.Deacon@....com>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	Sudeep Holla <Sudeep.Holla@....com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>
Subject: Re: [PATCH 00/15] arm/arm64: fix use of irq_find_mapping outside of legal RCU context

On Fri, Jul 11 2014 at  9:38:22 pm BST, Christopher Covington <cov@...eaurora.org> wrote:
> Hi Mark,
>
> On 07/08/2014 09:10 AM, Marc Zyngier wrote:
>> A number of irqchip drivers are directly calling irq_find_mapping,
>> which may use a rcu_read_lock call when walking the radix tree.
>
> If this happens to be easy for you to determine: do direct callers of
> irq_find_host such as irq_create_of_mapping have a similar problem with
> irq_domain_mutex?

Definitely not from this problem. irq_find_host doesn't use RCU at all,
so it shouldn't be an issue.

Thanks,

	M.
-- 
Jazz is not dead. It just smells funny.
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