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Subject[PATCH V2 19/63] clocksource/drivers/h8300_timer16: 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/h8300_timer16.c | 12 ++++++++----
1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/clocksource/h8300_timer16.c b/drivers/clocksource/h8300_timer16.c
index 75c4407..9d99fc8 100644
--- a/drivers/clocksource/h8300_timer16.c
+++ b/drivers/clocksource/h8300_timer16.c
@@ -126,7 +126,7 @@ static struct timer16_priv timer16_priv = {
#define REG_CH 0
#define REG_COMM 1

-static void __init h8300_16timer_init(struct device_node *node)
+static int __init h8300_16timer_init(struct device_node *node)
{
void __iomem *base[2];
int ret, irq;
@@ -136,9 +136,10 @@ static void __init h8300_16timer_init(struct device_node *node)
clk = of_clk_get(node, 0);
if (IS_ERR(clk)) {
pr_err("failed to get clock for clocksource\n");
- return;
+ return PTR_ERR(clk);
}

+ ret = -ENXIO;
base[REG_CH] = of_iomap(node, 0);
if (!base[REG_CH]) {
pr_err("failed to map registers for clocksource\n");
@@ -151,6 +152,7 @@ static void __init h8300_16timer_init(struct device_node *node)
goto unmap_ch;
}

+ ret = -EINVAL;
irq = irq_of_parse_and_map(node, 0);
if (!irq) {
pr_err("failed to get irq for clockevent\n");
@@ -174,7 +176,7 @@ static void __init h8300_16timer_init(struct device_node *node)

clocksource_register_hz(&timer16_priv.cs,
clk_get_rate(clk) / 8);
- return;
+ return 0;

unmap_comm:
iounmap(base[REG_COMM]);
@@ -182,6 +184,8 @@ unmap_ch:
iounmap(base[REG_CH]);
free_clk:
clk_put(clk);
+ return ret;
}

-CLOCKSOURCE_OF_DECLARE(h8300_16bit, "renesas,16bit-timer", h8300_16timer_init);
+CLOCKSOURCE_OF_DECLARE_RET(h8300_16bit, "renesas,16bit-timer",
+ h8300_16timer_init);
--
1.9.1
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