From 2783e5d63a9a38b5246c75b29f0dce4cf995a1b3 Mon Sep 17 00:00:00 2001 From: Alexandre Belloni Date: Fri, 9 Sep 2016 13:13:50 +0200 Subject: [PATCH] clocksource/drivers/timer-atmel-pit: Simplify IRQ handler Because the PIT is also a proper clocksource, the timekeeping code is already able to handle lost ticks. Reported-by: Thomas Gleixner Acked-by: Nicolas Ferre Signed-off-by: Alexandre Belloni Signed-off-by: Daniel Lezcano --- drivers/clocksource/timer-atmel-pit.c | 11 +++-------- 1 file changed, 3 insertions(+), 8 deletions(-) diff --git a/drivers/clocksource/timer-atmel-pit.c b/drivers/clocksource/timer-atmel-pit.c index 91cf047..6555821 100644 --- a/drivers/clocksource/timer-atmel-pit.c +++ b/drivers/clocksource/timer-atmel-pit.c @@ -152,15 +152,10 @@ static irqreturn_t at91sam926x_pit_interrupt(int irq, void *dev_id) /* The PIT interrupt may be disabled, and is shared */ if (clockevent_state_periodic(&data->clkevt) && (pit_read(data->base, AT91_PIT_SR) & AT91_PIT_PITS)) { - unsigned nr_ticks; - /* Get number of ticks performed before irq, and ack it */ - nr_ticks = PIT_PICNT(pit_read(data->base, AT91_PIT_PIVR)); - do { - data->cnt += data->cycle; - data->clkevt.event_handler(&data->clkevt); - nr_ticks--; - } while (nr_ticks); + data->cnt += data->cycle * PIT_PICNT(pit_read(data->base, + AT91_PIT_PIVR)); + data->clkevt.event_handler(&data->clkevt); return IRQ_HANDLED; } -- 2.7.4