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Subject[PATCH V2 52/63] clocksource/drivers/vf_pit_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/vf_pit_timer.c | 27 ++++++++++++++++++---------
1 file changed, 18 insertions(+), 9 deletions(-)

diff --git a/drivers/clocksource/vf_pit_timer.c b/drivers/clocksource/vf_pit_timer.c
index a0e6c68..ca4dff4 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);
--
1.9.1
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