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

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Message-Id: <1210925005.10881.12.camel@kevin-desktop>
Date:	Fri, 16 May 2008 16:03:25 +0800
From:	Kevin Hao <kexin.hao@...driver.com>
To:	Balaji Rao R <balajirrao@...il.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 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?

Thanks for your comments.

Best Regards,
Kevin

> 
> --
> warm regards
> 
> Balaji Rao
> NITK Surathkal
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