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    Subject[PATCH 8/9] clocksource/drivers/timer-atmel-pit: Simplify IRQ handler
    Date
    From: Alexandre Belloni <alexandre.belloni@free-electrons.com>

    Because the PIT is also a proper clocksource, the timekeeping code is
    already able to handle lost ticks.

    Reported-by: Thomas Gleixner <tglx@linutronix.de>
    Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
    Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
    Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
    ---
    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
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