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Commit 37a47db8 authored by Balaji Rao's avatar Balaji Rao Committed by Ingo Molnar
Browse files

x86: assign IRQs to HPET timers, fix 



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: default avatarBalaji Rao <balajirrao@gmail.com>
Tested-by: default avatarYinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent e3f37a54

arch/x86/kernel/hpet.c

+5 −5
Original line number Diff line number Diff line
@@ -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

drivers/char/hpet.c

+6 −0
Original line number Diff line number Diff line
@@ -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;