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Subject[PATCH V2 22/63] clocksource/drivers/mips-gic-timer: Convert init function to return error
Date
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>
---
drivers/clocksource/meson6_timer.c | 21 ++++++++++++++-------
1 file changed, 14 insertions(+), 7 deletions(-)

diff --git a/drivers/clocksource/meson6_timer.c b/drivers/clocksource/meson6_timer.c
index 1fa22c4..3a6e78f 100644
--- 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);
--
1.9.1
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