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

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Date:   Tue, 25 Jul 2017 14:16:36 +0100
From:   Måns Rullgård <mans@...sr.com>
To:     Marc Gonzalez <marc_gonzalez@...madesigns.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <marc.zyngier@....com>,
        Jason Cooper <jason@...edaemon.net>,
        Doug Berger <opendmb@...il.com>,
        Florian Fainelli <f.fainelli@...il.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

Marc Gonzalez <marc_gonzalez@...madesigns.com> writes:

> 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
> ---
> As discussed previously, it is acceptable for tango to rely
> on mask_ack_irq() doing the right thing(TM).
> ---
>  drivers/irqchip/irq-tango.c | 1 -
>  1 file changed, 1 deletion(-)
>
> diff --git a/drivers/irqchip/irq-tango.c b/drivers/irqchip/irq-tango.c
> index bdbb5c0ff7fe..825085cdab99 100644
> --- a/drivers/irqchip/irq-tango.c
> +++ b/drivers/irqchip/irq-tango.c
> @@ -141,7 +141,6 @@ static void __init tangox_irq_init_chip(struct irq_chip_generic *gc,
>  	for (i = 0; i < 2; i++) {
>  		ct[i].chip.irq_ack = irq_gc_ack_set_bit;
>  		ct[i].chip.irq_mask = irq_gc_mask_disable_reg;
> -		ct[i].chip.irq_mask_ack = irq_gc_mask_disable_reg_and_ack;
>  		ct[i].chip.irq_unmask = irq_gc_unmask_enable_reg;
>  		ct[i].chip.irq_set_type = tangox_irq_set_type;
>  		ct[i].chip.name = gc->domain->name;
> -- 

What happened to the patch adding the proper combined function?

-- 
Måns Rullgård