clocksource/drivers/meson6_timer.c: Convert init function to return error

The init functions do not return any error. They behave as the following:

  - panic, thus leading to a kernel crash while another timer may work and
       make the system boot up correctly

  or

  - print an error and let the caller unaware if the state of the system

Change that by converting the init functions to return an error conforming
to the CLOCKSOURCE_OF_RET prototype.

Proper error handling (rollback, errno value) will be changed later case
by case, thus this change just return back an error or success in the init
function.

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>

diff --git a/drivers/clocksource/meson6_timer.c b/drivers/clocksource/meson6_timer.c
index 1fa22c4..3a6e78f 100644 (file)
--- a/drivers/clocksource/meson6_timer.c
+++ b/drivers/clocksource/meson6_timer.c
@@ -126,18 +126,22 @@ static struct irqaction meson6_timer_irq = {
        .dev_id         = &meson6_clockevent,
 };
 
-static void __init meson6_timer_init(struct device_node *node)
+static int __init meson6_timer_init(struct device_node *node)
 {
        u32 val;
        int ret, irq;
 
        timer_base = of_io_request_and_map(node, 0, "meson6-timer");
-       if (IS_ERR(timer_base))
-               panic("Can't map registers");
+       if (IS_ERR(timer_base)) {
+               pr_err("Can't map registers");
+               return -ENXIO;
+       }
 
        irq = irq_of_parse_and_map(node, 0);
-       if (irq <= 0)
-               panic("Can't parse IRQ");
+       if (irq <= 0) {
+               pr_err("Can't parse IRQ");
+               return -EINVAL;
+       }
 
        /* Set 1us for timer E */
        val = readl(timer_base + TIMER_ISA_MUX);
@@ -158,14 +162,17 @@ static void __init meson6_timer_init(struct device_node *node)
        meson6_clkevt_time_stop(CED_ID);
 
        ret = setup_irq(irq, &meson6_timer_irq);
-       if (ret)
+       if (ret) {
                pr_warn("failed to setup irq %d\n", irq);
+               return ret;
+       }
 
        meson6_clockevent.cpumask = cpu_possible_mask;
        meson6_clockevent.irq = irq;
 
        clockevents_config_and_register(&meson6_clockevent, USEC_PER_SEC,
                                        1, 0xfffe);
+       return 0;
 }
-CLOCKSOURCE_OF_DECLARE(meson6, "amlogic,meson6-timer",
+CLOCKSOURCE_OF_DECLARE_RET(meson6, "amlogic,meson6-timer",
                       meson6_timer_init);