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SubjectRe: [PATCH 4.4-rt2] fix arm-at91-pit-remove-irq-handler-when-clock-is-unused.patch
* Alexandre Belloni | 2016-01-17 03:23:14 [+0100]:

>index 80d74c4adcbe..43b50634d640 100644
>--- a/drivers/clocksource/timer-atmel-pit.c
>+++ b/drivers/clocksource/timer-atmel-pit.c
>@@ -96,11 +96,44 @@ static int pit_clkevt_shutdown(struct clock_event_device *dev)
>
> /* disable irq, leaving the clocksource active */
> pit_write(data->base, AT91_PIT_MR, (data->cycle - 1) | AT91_PIT_PITEN);
>- free_irq(atmel_pit_irq, data);
>+ if (!clockevent_state_detached(dev))
>+ free_irq(data->irq, data);

I did it in the meantime without clockevent_state_detached(). From what
it looks, it first sets the state and then invokes
pit_clkevt_shutdown(). Any particular reason for this?

> return 0;
> }
>
> /*
>+ * IRQ handler for the timer.
>+ */
>+static irqreturn_t at91sam926x_pit_interrupt(int irq, void *dev_id)

this is just here to avoid to forward declaration.

>diff --git a/drivers/clocksource/timer-atmel-st.c b/drivers/clocksource/timer-atmel-st.c
>index ea37afc26e1b..11ce404d0791 100644
>--- a/drivers/clocksource/timer-atmel-st.c
>+++ b/drivers/clocksource/timer-atmel-st.c
>@@ -229,15 +229,15 @@ static void __init atmel_st_timer_init(struct device_node *node)
> regmap_read(regmap_st, AT91_ST_SR, &val);
>
> /* Get the interrupts property */
>- irq = irq_of_parse_and_map(node, 0);
>- if (!irq)
>+ atmel_st_irq = irq_of_parse_and_map(node, 0);
>+ if (!atmel_st_irq)
> panic(pr_fmt("Unable to get IRQ from DT\n"));
>
> sclk = of_clk_get(node, 0);
> if (IS_ERR(sclk))
> panic(pr_fmt("Unable to get slow clock\n"));
>
>- clk_prepare_enable(sclk);
>+ ret = clk_prepare_enable(sclk);
this piece applies to upstream v4.4.

> if (ret)
> panic(pr_fmt("Could not enable slow clock\n"));
>

Sebastian

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