clocksource/drivers/vf_pit_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>

1 files changed, 18 insertions, 9 deletions

diff --git a/drivers/clocksource/vf_pit_timer.c b/drivers/clocksource/vf_pit_timer.c
index a0e6c68536a1..ca4dff4d5684 100644
--- a/drivers/clocksource/vf_pit_timer.c
+++ b/drivers/clocksource/vf_pit_timer.c
@@ -156,15 +156,18 @@ static int __init pit_clockevent_init(unsigned long rate, int irq)
         return 0;
 }
 
-static void __init pit_timer_init(struct device_node *np)
+static int __init pit_timer_init(struct device_node *np)
 {
         struct clk *pit_clk;
         void __iomem *timer_base;
         unsigned long clk_rate;
-        int irq;
+        int irq, ret;
 
         timer_base = of_iomap(np, 0);
-        BUG_ON(!timer_base);
+        if (!timer_base) {
+                pr_err("Failed to iomap");
+                return -ENXIO;
+        }
 
         /*
          * PIT0 and PIT1 can be chained to build a 64-bit timer,
@@ -175,12 +178,16 @@ static void __init pit_timer_init(struct device_node *np)
         clkevt_base = timer_base + PITn_OFFSET(3);
 
         irq = irq_of_parse_and_map(np, 0);
-        BUG_ON(irq <= 0);
+        if (irq <= 0)
+                return -EINVAL;
 
         pit_clk = of_clk_get(np, 0);
-        BUG_ON(IS_ERR(pit_clk));
+        if (IS_ERR(pit_clk))
+                return PTR_ERR(pit_clk);
 
-        BUG_ON(clk_prepare_enable(pit_clk));
+        ret = clk_prepare_enable(pit_clk);
+        if (ret)
+                return ret;
 
         clk_rate = clk_get_rate(pit_clk);
         cycle_per_jiffy = clk_rate / (HZ);
@@ -188,8 +195,10 @@ static void __init pit_timer_init(struct device_node *np)
         /* enable the pit module */
         __raw_writel(~PITMCR_MDIS, timer_base + PITMCR);
 
-        BUG_ON(pit_clocksource_init(clk_rate));
+        ret = pit_clocksource_init(clk_rate);
+        if (ret)
+                return ret;
 
-        pit_clockevent_init(clk_rate, irq);
+        return pit_clockevent_init(clk_rate, irq);
 }
-CLOCKSOURCE_OF_DECLARE(vf610, "fsl,vf610-pit", pit_timer_init);
+CLOCKSOURCE_OF_DECLARE_RET(vf610, "fsl,vf610-pit", pit_timer_init);