linux-kernel - Re: [PATCH v2] irqchip/mips-gic: Add missing shared interrupt handler

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Date:   Thu, 6 Jul 2017 14:03:59 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     jrjang@...il.com
cc:     Jason Cooper <jason@...edaemon.net>,
        Marc Zyngier <marc.zyngier@....com>,
        LKML <linux-kernel@...r.kernel.org>,
        Paul Burton <paul.burton@...tec.com>,
        Matt Redfearn <matt.redfearn@...tec.com>,
        Ralf Baechle <ralf@...ux-mips.org>
Subject: Re: [PATCH v2] irqchip/mips-gic: Add missing shared interrupt
 handler

On Thu, 6 Jul 2017, jrjang@...il.com wrote:

CC+ MIPS folks. There is a reason WHY I added them to my previous reply.

> From: Jun-Ru Chang <jrjang@...il.com>
> 
> Commit b87281e7f205 ("irqchip/mips-gic: Remove device IRQ domain")
> removes the device IRQ domain and uses gic_irq_domain_alloc() to
> allocate the shared/local domain. However, the shared interrupt handler
> is not set after allocating. It causes that the system hangs with
> "unexpected IRQ" messages disaply.
> 
> And commit 8ada00a650ec ("irqchip/mips-gic: Replace static map with
> dynamic") renames gic_irq_domain_alloc() to gic_irq_domain_map() to set
> up the handler and chip. Fix this by setting the handle_level_irq
> handler for shared interrupts.
> 
> Fixes: b87281e7f205 ("irqchip/mips-gic: Remove device IRQ domain")
> Signed-off-by: Jun-Ru Chang <jrjang@...il.com>
> ---
> Change in v2:
> - changed commit message
> 
>  drivers/irqchip/irq-mips-gic.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/irqchip/irq-mips-gic.c b/drivers/irqchip/irq-mips-gic.c
> index 929f8558bf1c..0a5fb30deb17 100644
> --- a/drivers/irqchip/irq-mips-gic.c
> +++ b/drivers/irqchip/irq-mips-gic.c
> @@ -716,6 +716,7 @@ static int gic_irq_domain_map(struct irq_domain *d, unsigned int virq,
>  		if (err)
>  			return err;
>  
> +		irq_set_handler(virq, handle_level_irq);
>  		return gic_shared_irq_domain_map(d, virq, hwirq, 0);
>  	}
>  
> -- 
> 2.13.2
>