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From: Thomas Gleixner <tglx@linutronix.de>
To: Florian Fainelli <florian.fainelli@broadcom.com>,
 linux-kernel@vger.kernel.org
Cc: opendmb@gmail.com, Florian Fainelli <florian.fainelli@broadcom.com>, Tim
 Ross <tim.ross@broadcom.com>, Broadcom internal kernel review list
 <bcm-kernel-feedback-list@broadcom.com>, "open list:BROADCOM BMIPS MIPS
 ARCHITECTURE" <linux-mips@vger.kernel.org>, "moderated list:BROADCOM
 BCM7XXX ARM
 ARCHITECTURE" <linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH] irqchip/irq-brcmstb-l2: Avoid saving mask on shutdown
In-Reply-To: <20240416194343.469318-1-florian.fainelli@broadcom.com>
References: <20240416194343.469318-1-florian.fainelli@broadcom.com>
Date: Mon, 22 Apr 2024 23:29:14 +0200
Message-ID: <87le55ulw5.ffs@tglx>
Precedence: bulk
MIME-Version: 1.0
Content-Type: text/plain

On Tue, Apr 16 2024 at 12:43, Florian Fainelli wrote:
> The interrupt controller shutdown path does not need to save the mask of
> enabled interrupts because the next state the system is going to be in
> is akin to a cold boot, or a kexec'd kernel.

Sure, but

> Reported-by: Tim Ross <tim.ross@broadcom.com>
> Signed-off-by: Florian Fainelli <florian.fainelli@broadcom.com>
> ---
>  drivers/irqchip/irq-brcmstb-l2.c | 17 ++++++++++++++---
>  1 file changed, 14 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/irqchip/irq-brcmstb-l2.c b/drivers/irqchip/irq-brcmstb-l2.c
> index 2b0b3175cea0..c988886917f7 100644
> --- a/drivers/irqchip/irq-brcmstb-l2.c
> +++ b/drivers/irqchip/irq-brcmstb-l2.c
> @@ -118,7 +118,7 @@ static void brcmstb_l2_intc_irq_handle(struct irq_desc *desc)
>  	chained_irq_exit(chip, desc);
>  }
>  
> -static void brcmstb_l2_intc_suspend(struct irq_data *d)
> +static void __brcmstb_l2_intc_suspend(struct irq_data *d, bool save)
>  {
>  	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
>  	struct irq_chip_type *ct = irq_data_get_chip_type(d);
> @@ -127,7 +127,8 @@ static void brcmstb_l2_intc_suspend(struct irq_data *d)
>  
>  	irq_gc_lock_irqsave(gc, flags);
>  	/* Save the current mask */
> -	b->saved_mask = irq_reg_readl(gc, ct->regs.mask);
> +	if (save)
> +		b->saved_mask = irq_reg_readl(gc, ct->regs.mask);

what's the conditional actually buying you except more complex code?

Thanks,

        tglx