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x86: assign IRQs to HPET timers, fix

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Looks like IRQ 31 is assigned to timer 3, even without the patch!
I wonder who wrote the number 31. But the manual says that it is
zero by default.

I think we should check whether the timer has been allocated an IRQ before
proceeding to assign one to it.  Here is a patch that does this.

Signed-off-by: Balaji Rao <balajirrao@gmail.com>
Tested-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Balaji Rao 2008-01-30 13:30:03 +01:00 committed by Ingo Molnar
parent e3f37a54f6
commit 37a47db8d7
2 changed files with 11 additions and 5 deletions
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10
arch/x86/kernel/hpet.c
View file

@ -117,7 +117,8 @@ int is_hpet_enabled(void)
static void hpet_reserve_platform_timers(unsigned long id)
{
struct hpet __iomem *hpet = hpet_virt_address;
unsigned int nrtimers;
struct hpet_timer __iomem *timer = &hpet->hpet_timers[2];
unsigned int nrtimers, i;
struct hpet_data hd;
nrtimers = ((id & HPET_ID_NUMBER) >> HPET_ID_NUMBER_SHIFT) + 1;
@ -135,10 +136,9 @@ static void hpet_reserve_platform_timers(unsigned long id)
hd.hd_irq[0] = HPET_LEGACY_8254;
hd.hd_irq[1] = HPET_LEGACY_RTC;
/*
* IRQs for the other timers are assigned dynamically
* in hpet_alloc
*/
for (i = 2; i < nrtimers; timer++, i++)
hd.hd_irq[i] = (timer->hpet_config & Tn_INT_ROUTE_CNF_MASK) >>
Tn_INT_ROUTE_CNF_SHIFT;
hpet_alloc(&hd);
}
#else

6
drivers/char/hpet.c
View file

@ -852,6 +852,12 @@ int hpet_alloc(struct hpet_data *hdp)
timer = &hpet->hpet_timers[devp - hpetp->hp_dev];
/* Check if there's already an IRQ assigned to the timer */
if (hdp->hd_irq[i]) {
hpetp->hp_dev[i].hd_hdwirq = hdp->hd_irq[i];
continue;
}
hpet_config = readq(&timer->hpet_config);
irq_bitmap = (hpet_config & Tn_INT_ROUTE_CAP_MASK)
>> Tn_INT_ROUTE_CAP_SHIFT;