linux-kernel - Re: [PATCH 2/3] HPET: Enter hpet_interrupt

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Date:	Sun, 2 Nov 2008 21:35:31 +0000
From:	"Will Newton" <will.newton@...il.com>
To:	"Matt Fleming" <mjf@...too.org>
Cc:	linux-kernel@...r.kernel.org, tglx@...utronix.de, mingo@...e.hu,
	venkatesh.pallipadi@...el.com
Subject: Re: [PATCH 2/3] HPET: Enter hpet_interrupt_handler with interrupts disabled

On Sun, Nov 2, 2008 at 4:04 PM, Matt Fleming <mjf@...too.org> wrote:
> Some functions that may be called from this handler require that
> interrupts are disabled.
>
> Signed-off-by: Matt Fleming <mjf@...too.org>
> ---
>  arch/x86/kernel/hpet.c |    3 ++-
>  1 files changed, 2 insertions(+), 1 deletions(-)
>
> diff --git a/arch/x86/kernel/hpet.c b/arch/x86/kernel/hpet.c
> index f10f946..c28fff2 100644
> --- a/arch/x86/kernel/hpet.c
> +++ b/arch/x86/kernel/hpet.c
> @@ -445,7 +445,8 @@ static int hpet_setup_irq(struct hpet_dev *dev)
>  {
>
>        if (request_irq(dev->irq, hpet_interrupt_handler,
> -                       IRQF_SHARED|IRQF_NOBALANCING, dev->name, dev))
> +                       IRQF_DISABLED|IRQF_SHARED|IRQF_NOBALANCING,
> +                       dev->name, dev))

Combining IRQF_DISABLED and IRQF_SHARED does not reliably disable
interrupts in the handler. Perhaps IRQF_SHARED should be removed at
the same time?

>                return -1;
>
>        disable_irq(dev->irq);
> --
> 1.5.6.4
>
> --
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