[PATCH V2 39/63] clocksource/drivers/timer-atlas7: Convert init function to return error

[Daniel Lezcano]

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.lezc...@linaro.org>
---
 drivers/clocksource/timer-atlas7.c | 32 +++++++++++++++++++-------------
 1 file changed, 19 insertions(+), 13 deletions(-)

diff --git a/drivers/clocksource/timer-atlas7.c 
b/drivers/clocksource/timer-atlas7.c
index 27fa136..7b1a007 100644
--- a/drivers/clocksource/timer-atlas7.c
+++ b/drivers/clocksource/timer-atlas7.c
@@ -238,7 +238,7 @@ static struct notifier_block sirfsoc_cpu_nb = {
        .notifier_call = sirfsoc_cpu_notify,
 };
 
-static void __init sirfsoc_clockevent_init(void)
+static int __init sirfsoc_clockevent_init(void)
 {
        sirfsoc_clockevent = alloc_percpu(struct clock_event_device);
        BUG_ON(!sirfsoc_clockevent);
@@ -246,11 +246,11 @@ static void __init sirfsoc_clockevent_init(void)
        BUG_ON(register_cpu_notifier(&sirfsoc_cpu_nb));
 
        /* Immediately configure the timer on the boot CPU */
-       sirfsoc_local_timer_setup(this_cpu_ptr(sirfsoc_clockevent));
+       return sirfsoc_local_timer_setup(this_cpu_ptr(sirfsoc_clockevent));
 }
 
 /* initialize the kernel jiffy timer source */
-static void __init sirfsoc_atlas7_timer_init(struct device_node *np)
+static int __init sirfsoc_atlas7_timer_init(struct device_node *np)
 {
        struct clk *clk;
 
@@ -279,23 +279,29 @@ static void __init sirfsoc_atlas7_timer_init(struct 
device_node *np)
 
        BUG_ON(clocksource_register_hz(&sirfsoc_clocksource, 
atlas7_timer_rate));
 
-       sirfsoc_clockevent_init();
+       return sirfsoc_clockevent_init();
 }
 
-static void __init sirfsoc_of_timer_init(struct device_node *np)
+static int __init sirfsoc_of_timer_init(struct device_node *np)
 {
        sirfsoc_timer_base = of_iomap(np, 0);
-       if (!sirfsoc_timer_base)
-               panic("unable to map timer cpu registers\n");
+       if (!sirfsoc_timer_base) {
+               pr_err("unable to map timer cpu registers\n");
+               return -ENXIO;
+       }
 
        sirfsoc_timer_irq.irq = irq_of_parse_and_map(np, 0);
-       if (!sirfsoc_timer_irq.irq)
-               panic("No irq passed for timer0 via DT\n");
+       if (!sirfsoc_timer_irq.irq) {
+               pr_err("No irq passed for timer0 via DT\n");
+               return -EINVAL;
+       }
 
        sirfsoc_timer1_irq.irq = irq_of_parse_and_map(np, 1);
-       if (!sirfsoc_timer1_irq.irq)
-               panic("No irq passed for timer1 via DT\n");
+       if (!sirfsoc_timer1_irq.irq) {
+               pr_err("No irq passed for timer1 via DT\n");
+               return -EINVAL;
+       }
 
-       sirfsoc_atlas7_timer_init(np);
+       return sirfsoc_atlas7_timer_init(np);
 }
-CLOCKSOURCE_OF_DECLARE(sirfsoc_atlas7_timer, "sirf,atlas7-tick", 
sirfsoc_of_timer_init);
+CLOCKSOURCE_OF_DECLARE_RET(sirfsoc_atlas7_timer, "sirf,atlas7-tick", 
sirfsoc_of_timer_init);
-- 
1.9.1