linux-kernel - Re: [PATCH v3] irqchip/tango: Don't use incorrect irq_mask

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Date:   Tue, 25 Jul 2017 16:15:02 +0200
From:   Marc Gonzalez <marc_gonzalez@...madesigns.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <marc.zyngier@....com>,
        Jason Cooper <jason@...edaemon.net>
CC:     Doug Berger <opendmb@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Mans Rullgard <mans@...sr.com>,
        LKML <linux-kernel@...r.kernel.org>,
        "Linux ARM" <linux-arm-kernel@...ts.infradead.org>,
        Mason <slash.tmp@...e.fr>
Subject: Re: [PATCH v3] irqchip/tango: Don't use incorrect irq_mask_ack
 callback

On 25/07/2017 15:08, Marc Gonzalez wrote:

> irq_gc_mask_disable_reg_and_ack() is not equivalent to
> irq_gc_mask_disable_reg() and irq_gc_ack_set_bit().
> 
> Leave the irq_mask_ack callback undefined, and let the irqchip
> framework use irq_mask and irq_ack instead.
> 
> Reported-by: Doug Berger <opendmb@...il.com>
> Fixes: 4bba66899ac6 ("irqchip/tango: Add support for Sigma Designs SMP86xx/SMP87xx interrupt controller")
> Signed-off-by: Marc Gonzalez <marc_gonzalez@...madesigns.com>
> Cc: stable@...r.kernel.org

FWIW, the lockup reported in the thread below disappears
once the patch is applied.

https://lkml.org/lkml/2016/10/21/709

Regards.