linux-kernel - Re: [PATCH] irqchip: brcmstb-l2: use _irqsave variants in non-interrupt code

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Message-ID: <b004e1f2-0b9e-a75c-4f6e-1daa2f0e7eed@gmail.com>
Date:   Thu, 21 Feb 2019 13:02:54 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Marc Zyngier <marc.zyngier@....com>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     linux-kernel@...r.kernel.org, Doug Berger <opendmb@...il.com>,
        Kevin Cernekee <cernekee@...il.com>,
        Jason Cooper <jason@...edaemon.net>,
        Brian Norris <computersforpeace@...il.com>,
        Gregory Fong <gregory.0xf0@...il.com>,
        "maintainer:BROADCOM BCM7XXX ARM ARCHITECTURE" 
        <bcm-kernel-feedback-list@...adcom.com>,
        "open list:BROADCOM BMIPS MIPS ARCHITECTURE" 
        <linux-mips@...r.kernel.org>,
        "moderated list:BROADCOM BCM7XXX ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] irqchip: brcmstb-l2: use _irqsave variants in
 non-interrupt code

On 2/21/19 2:15 AM, Marc Zyngier wrote:
> On Wed, 20 Feb 2019 14:15:28 -0800
> Florian Fainelli <f.fainelli@...il.com> wrote:
> 
>> From: Doug Berger <opendmb@...il.com>
>>
>> Using the irq_gc_lock/irq_gc_unlock functions in the suspend and
>> resume functions creates the opportunity for a deadlock during
>> suspend, resume, and shutdown. Using the irq_gc_lock_irqsave/
>> irq_gc_unlock_irqrestore variants prevents this possible deadlock.
>>
>> Signed-off-by: Doug Berger <opendmb@...il.com>
>> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
> 
> Applied to irqchip-next with:
> 
> Cc: stable@...r.kernel.org
> Fixes: 7f646e92766e2 ("irqchip: brcmstb-l2: Add Broadcom Set Top Box
> Level-2 interrupt controller")
> 
> Now, I'm worried this is not the only issue, see below.

Thanks for adding the Fixes tag, I should have done that, but did not
consider it to be a particularly serious issue (we have not see it in
real life, just only when LOCKDEP is enabled).
-- 
Florian