linux-kernel - Re: [PATCH] irqchip/atmel-aic: Fix potential deadlock in ->xlate()

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Date:   Tue, 13 Sep 2016 13:21:28 +0100
From:   Marc Zyngier <marc.zyngier@....com>
To:     Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>
Cc:     Nicolas Ferre <nicolas.ferre@...el.com>,
        Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
        Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
        linux-kernel@...r.kernel.org, stable@...nel.vger.org
Subject: Re: [PATCH] irqchip/atmel-aic: Fix potential deadlock in ->xlate()

On 13/09/16 12:23, Boris Brezillon wrote:
> On Tue, 13 Sep 2016 12:10:09 +0200
> Boris Brezillon <boris.brezillon@...e-electrons.com> wrote:
> 
>> aic5_irq_domain_xlate() and aic_irq_domain_xlate() take the generic chip
>> lock without disabling interrupts, which can lead to a deadlock if an
>> interrupt occurs while the lock is held in one of these functions.
>>
>> Replace irq_gc_{lock,unlock}() calls by
>> raw_spin_{lock_irqsave,unlock_irqrestore}() ones to prevent this bug from
>> happening.
>>
>> Signed-off-by: Boris Brezillon <boris.brezillon@...e-electrons.com>
>> Fixes: b1479ebb7720 ("irqchip: atmel-aic: Add atmel AIC/AIC5 drivers")
>> Cc: <stable@...nel.vger.org>
> 
> Oops, should be
> 
> Cc: <stable@...r.kernel.org>
> 
> Do you want me to send a v2?

You might as well, so that tglx can pick the patch with my ack on it.

Thanks,

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