linux-kernel - Re: [PATCH] irq: Warn when shared interrupts do not match on NO

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Date:	Thu, 24 Jul 2014 15:46:38 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Peter Zijlstra <peterz@...radead.org>
cc:	rjw@...ysocki.net, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] irq: Warn when shared interrupts do not match on
 NO_SUSPEND

On Thu, 24 Jul 2014, Peter Zijlstra wrote:

> Subject: irq: Warn when shared interrupts do not match on NO_SUSPEND
> 
> When suspend_device_irqs() iterates all descriptors, its pointless if
> one has NO_SUSPEND set while another has not.
> 
> Validate on request_irq() that NO_SUSPEND state maches for SHARED
> interrupts.

I'm happy to take that patch, but you are aware that it is going to
break a few things?

  25:  ....   PCI-MSI-edge      aerdrv, PCIe PME

Thanks,

	tglx
 
> Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Signed-off-by: Peter Zijlstra <peterz@...radead.org>
> ---
>  kernel/irq/manage.c | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
> index 88657d7bc9dd..27a1fe028afb 100644
> --- a/kernel/irq/manage.c
> +++ b/kernel/irq/manage.c
> @@ -1077,9 +1077,12 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
>  		 * set the trigger type must match. Also all must
>  		 * agree on ONESHOT.
>  		 */
> +
> +#define IRQF_MISMATCH \
> +	(IRQF_TRIGGER_MASK | IRQF_ONESHOT | IRQF_NO_SUSPEND)
> +
>  		if (!((old->flags & new->flags) & IRQF_SHARED) ||
> -		    ((old->flags ^ new->flags) & IRQF_TRIGGER_MASK) ||
> -		    ((old->flags ^ new->flags) & IRQF_ONESHOT))
> +		    ((old->flags ^ new->flags) & IRQF_MISMATCH))
>  			goto mismatch;
>  
>  		/* All handlers must agree on per-cpuness */
> 
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