diff options
| -rw-r--r-- | drivers/char/hpet.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/char/hpet.c b/drivers/char/hpet.c index 84e6a7e673b7..a2cbb828e92a 100644 --- a/drivers/char/hpet.c +++ b/drivers/char/hpet.c @@ -465,6 +465,21 @@ static int hpet_ioctl_ieon(struct hpet_dev *devp) if (irq) { unsigned long irq_flags; + if (devp->hd_flags & HPET_SHARED_IRQ) { + /* + * To prevent the interrupt handler from seeing an + * unwanted interrupt status bit, program the timer + * so that it will not fire in the near future ... + */ + writel(readl(&timer->hpet_config) & ~Tn_TYPE_CNF_MASK, + &timer->hpet_config); + write_counter(read_counter(&hpet->hpet_mc), + &timer->hpet_compare); + /* ... and clear any left-over status. */ + isr = 1 << (devp - devp->hd_hpets->hp_dev); + writel(isr, &hpet->hpet_isr); + } + sprintf(devp->hd_name, "hpet%d", (int)(devp - hpetp->hp_dev)); irq_flags = devp->hd_flags & HPET_SHARED_IRQ ? IRQF_SHARED : IRQF_DISABLED; |