linux-kernel - Re: [PATCH v5 2/9] drivers: irqchip: Add STM32 external interrupts support

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Date:   Tue, 13 Sep 2016 17:21:26 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Alexandre TORGUE <alexandre.torgue@...com>
cc:     Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Jason Cooper <jason@...edaemon.net>,
        Marc Zyngier <marc.zyngier@....com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        Rob Herring <robh+dt@...nel.org>, linux-gpio@...r.kernel.org,
        arnd@...db.de, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        Daniel Thompson <daniel.thompson@...aro.org>,
        bruherrera@...il.com, lee.jones@...aro.org
Subject: Re: [PATCH v5 2/9] drivers: irqchip: Add STM32 external interrupts
 support

On Fri, 9 Sep 2016, Alexandre TORGUE wrote:
> +static void stm32_exti_free(struct irq_domain *d, unsigned int virq,
> +			    unsigned int nr_irqs)
> +{
> +	struct irq_data *data = irq_get_irq_data(virq);
> +
> +	irq_gc_mask_clr_bit(data->parent_data);

I have a hard time to understand this. The irq domain is not hierarchical.

> +	irq_domain_reset_irq_data(data);

> +	domain = irq_domain_add_linear(node, nr_exti,
> +				       &irq_exti_domain_ops, NULL);

It's a simple linear domain. So how can data->parent_data be a valid
irq_data pointer? Answer: It can't!

But it doesn't blow up in your face simply because the alloc/free callbacks
are never invoked for simple non hierarchical domains. So you should have
removed that stuff after copying some other irqchip driver.

Thanks,

	tglx