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Subject[PATCH V2 47/63] clocksource/drivers/timer-stm32: 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/timer-stm32.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/clocksource/timer-stm32.c b/drivers/clocksource/timer-stm32.c
index f3dcb76..d5bf352 100644
--- a/drivers/clocksource/timer-stm32.c
+++ b/drivers/clocksource/timer-stm32.c
@@ -98,7 +98,7 @@ static struct stm32_clock_event_ddata clock_event_ddata = {
},
};

-static void __init stm32_clockevent_init(struct device_node *np)
+static int __init stm32_clockevent_init(struct device_node *np)
{
struct stm32_clock_event_ddata *data = &clock_event_ddata;
struct clk *clk;
@@ -130,12 +130,14 @@ static void __init stm32_clockevent_init(struct device_node *np)

data->base = of_iomap(np, 0);
if (!data->base) {
+ ret = -ENXIO;
pr_err("failed to map registers for clockevent\n");
goto err_iomap;
}

irq = irq_of_parse_and_map(np, 0);
if (!irq) {
+ ret = -EINVAL;
pr_err("%s: failed to get irq.\n", np->full_name);
goto err_get_irq;
}
@@ -173,7 +175,7 @@ static void __init stm32_clockevent_init(struct device_node *np)
pr_info("%s: STM32 clockevent driver initialized (%d bits)\n",
np->full_name, bits);

- return;
+ return ret;

err_get_irq:
iounmap(data->base);
@@ -182,7 +184,7 @@ err_iomap:
err_clk_enable:
clk_put(clk);
err_clk_get:
- return;
+ return ret;
}

-CLOCKSOURCE_OF_DECLARE(stm32, "st,stm32-timer", stm32_clockevent_init);
+CLOCKSOURCE_OF_DECLARE_RET(stm32, "st,stm32-timer", stm32_clockevent_init);
--
1.9.1
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