linux-kernel - Re: [PATCH] x86: Get irq for hpet timer

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Date:	Fri, 16 May 2008 14:00:32 +0530
From:	Balaji Rao <balajirrao@...il.com>
To:	Kevin Hao <kexin.hao@...driver.com>
Cc:	venkatesh.pallipadi@...el.com, clemens@...isch.de,
	bob.picco@...com, mingo@...hat.com, tglx@...utronix.de,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86: Get irq for hpet timer

On Friday 16 May 2008 01:33:25 pm Kevin Hao wrote:
> On Fri, 2008-05-16 at 13:23 +0530, Balaji Rao R wrote:
> > On Fri, May 16, 2008 at 11:35 AM, Kevin Hao <kexin.hao@...driver.com> 
wrote:
> > > Hi,
> > >
> > > x86: get irq for hpet timer
> > >
> > > HPET timer's IRQ is 0 by default, so we have to select which irq
> > > will be used for these timers. We wait to set the timer's irq until
> > > we really turn on interrupt in order to reduce the chance of
> > > conflicting with some legacy device.
> >
> > Yes, this is alright. But  i've seen some machines where we have a
> > valid IRQ in 'devp->hd_hdwirq' which you should not ignore. So, first
> > check if it is zero and only then do a hpet_timer_get_irq.
>
> Yes, I have checked that case in hpet_timer_get_irq function. See the
> following code:
>
> +       irq = devp->hd_hdwirq;
>
>
> +       if (irq) {
> +               if (request_irq(irq, hpet_interrupt, irq_flags,
> +                               devp->hd_name, (void *)devp)) {
> +                       printk(KERN_ERR "hpet: IRQ %d is not free\n",
> irq);
> +                       irq = 0;
> +               }
> +               return irq;
> +       }
>
> Is that right?
>
Yes. You are right. Sorry for not going through the patch fully before making 
noise.

-- 
Warm Regards,

Balaji Rao
Dept. of Mechanical Engineering
NITK
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