clocksource/drivers/fsl_ftm_timer: 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/fsl_ftm_timer.c b/drivers/clocksource/fsl_ftm_timer.c
index 517e1c7..9ad4ca3 100644 (file)
--- a/drivers/clocksource/fsl_ftm_timer.c
+++ b/drivers/clocksource/fsl_ftm_timer.c
@@ -316,15 +316,16 @@ static int __init ftm_calc_closest_round_cyc(unsigned long freq)
        return 0;
 }
 
-static void __init ftm_timer_init(struct device_node *np)
+static int __init ftm_timer_init(struct device_node *np)
 {
        unsigned long freq;
-       int irq;
+       int ret, irq;
 
        priv = kzalloc(sizeof(*priv), GFP_KERNEL);
        if (!priv)
-               return;
+               return -ENOMEM;
 
+       ret = -ENXIO;
        priv->clkevt_base = of_iomap(np, 0);
        if (!priv->clkevt_base) {
                pr_err("ftm: unable to map event timer registers\n");
@@ -337,6 +338,7 @@ static void __init ftm_timer_init(struct device_node *np)
                goto err;
        }
 
+       ret = -EINVAL;
        irq = irq_of_parse_and_map(np, 0);
        if (irq <= 0) {
                pr_err("ftm: unable to get IRQ from DT, %d\n", irq);
@@ -349,18 +351,22 @@ static void __init ftm_timer_init(struct device_node *np)
        if (!freq)
                goto err;
 
-       if (ftm_calc_closest_round_cyc(freq))
+       ret = ftm_calc_closest_round_cyc(freq);
+       if (ret)
                goto err;
 
-       if (ftm_clocksource_init(freq))
+       ret = ftm_clocksource_init(freq);
+       if (ret)
                goto err;
 
-       if (ftm_clockevent_init(freq, irq))
+       ret = ftm_clockevent_init(freq, irq);
+       if (ret)
                goto err;
 
-       return;
+       return 0;
 
 err:
        kfree(priv);
+       return ret;
 }
-CLOCKSOURCE_OF_DECLARE(flextimer, "fsl,ftm-timer", ftm_timer_init);
+CLOCKSOURCE_OF_DECLARE_RET(flextimer, "fsl,ftm-timer", ftm_timer_init);