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Subject[PATCH V2 34/63] clocksource/drivers/time-efm32: 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/time-armada-370-xp.c | 102 +++++++++++++++++++++++--------
1 file changed, 76 insertions(+), 26 deletions(-)

diff --git a/drivers/clocksource/time-armada-370-xp.c b/drivers/clocksource/time-armada-370-xp.c
index 601dbf74..bc4ab48 100644
--- a/drivers/clocksource/time-armada-370-xp.c
+++ b/drivers/clocksource/time-armada-370-xp.c
@@ -260,14 +260,22 @@ static struct delay_timer armada_370_delay_timer = {
.read_current_timer = armada_370_delay_timer_read,
};

-static void __init armada_370_xp_timer_common_init(struct device_node *np)
+static int __init armada_370_xp_timer_common_init(struct device_node *np)
{
u32 clr = 0, set = 0;
int res;

timer_base = of_iomap(np, 0);
- WARN_ON(!timer_base);
+ if (!timer_base) {
+ pr_err("Failed to iomap");
+ return -ENXIO;
+ }
+
local_base = of_iomap(np, 1);
+ if (!local_base) {
+ pr_err("Failed to iomap");
+ return -ENXIO;
+ }

if (timer25Mhz) {
set = TIMER0_25MHZ;
@@ -306,14 +314,19 @@ static void __init armada_370_xp_timer_common_init(struct device_node *np)
*/
sched_clock_register(armada_370_xp_read_sched_clock, 32, timer_clk);

- clocksource_mmio_init(timer_base + TIMER0_VAL_OFF,
- "armada_370_xp_clocksource",
- timer_clk, 300, 32, clocksource_mmio_readl_down);
+ res = clocksource_mmio_init(timer_base + TIMER0_VAL_OFF,
+ "armada_370_xp_clocksource",
+ timer_clk, 300, 32, clocksource_mmio_readl_down);
+ if (res) {
+ pr_err("Failed to initialize clocksource mmio");
+ return res;
+ }

register_cpu_notifier(&armada_370_xp_timer_cpu_nb);

armada_370_xp_evt = alloc_percpu(struct clock_event_device);
-
+ if (!armada_370_xp_evt)
+ return -ENOMEM;

/*
* Setup clockevent timer (interrupt-driven).
@@ -323,33 +336,54 @@ static void __init armada_370_xp_timer_common_init(struct device_node *np)
"armada_370_xp_per_cpu_tick",
armada_370_xp_evt);
/* Immediately configure the timer on the boot CPU */
- if (!res)
- armada_370_xp_timer_setup(this_cpu_ptr(armada_370_xp_evt));
+ if (res) {
+ pr_err("Failed to request percpu irq");
+ return res;
+ }
+
+ res = armada_370_xp_timer_setup(this_cpu_ptr(armada_370_xp_evt));
+ if (!res) {
+ pr_err("Failed to setup timer");
+ return res;
+ }

register_syscore_ops(&armada_370_xp_timer_syscore_ops);
+
+ return 0;
}

-static void __init armada_xp_timer_init(struct device_node *np)
+static int __init armada_xp_timer_init(struct device_node *np)
{
struct clk *clk = of_clk_get_by_name(np, "fixed");
+ int ret;
+
+ clk = of_clk_get(np, 0);
+ if (IS_ERR(clk)) {
+ pr_err("Failed to get clock");
+ return PTR_ERR(clk);
+ }
+
+ ret = clk_prepare_enable(clk);
+ if (ret)
+ return ret;

- /* The 25Mhz fixed clock is mandatory, and must always be available */
- BUG_ON(IS_ERR(clk));
- clk_prepare_enable(clk);
timer_clk = clk_get_rate(clk);

- armada_370_xp_timer_common_init(np);
+ return armada_370_xp_timer_common_init(np);
}
-CLOCKSOURCE_OF_DECLARE(armada_xp, "marvell,armada-xp-timer",
+CLOCKSOURCE_OF_DECLARE_RET(armada_xp, "marvell,armada-xp-timer",
armada_xp_timer_init);

-static void __init armada_375_timer_init(struct device_node *np)
+static int __init armada_375_timer_init(struct device_node *np)
{
struct clk *clk;
+ int ret;

clk = of_clk_get_by_name(np, "fixed");
if (!IS_ERR(clk)) {
- clk_prepare_enable(clk);
+ ret = clk_prepare_enable(clk);
+ if (ret)
+ return ret;
timer_clk = clk_get_rate(clk);
} else {

@@ -360,27 +394,43 @@ static void __init armada_375_timer_init(struct device_node *np)
clk = of_clk_get(np, 0);

/* Must have at least a clock */
- BUG_ON(IS_ERR(clk));
- clk_prepare_enable(clk);
+ if (IS_ERR(clk)) {
+ pr_err("Failed to get clock");
+ return PTR_ERR(clk);
+ }
+
+ ret = clk_prepare_enable(clk);
+ if (ret)
+ return ret;
+
timer_clk = clk_get_rate(clk) / TIMER_DIVIDER;
timer25Mhz = false;
}

- armada_370_xp_timer_common_init(np);
+ return armada_370_xp_timer_common_init(np);
}
-CLOCKSOURCE_OF_DECLARE(armada_375, "marvell,armada-375-timer",
+CLOCKSOURCE_OF_DECLARE_RET(armada_375, "marvell,armada-375-timer",
armada_375_timer_init);

-static void __init armada_370_timer_init(struct device_node *np)
+static int __init armada_370_timer_init(struct device_node *np)
{
- struct clk *clk = of_clk_get(np, 0);
+ struct clk *clk;
+ int ret;
+
+ clk = of_clk_get(np, 0);
+ if (IS_ERR(clk)) {
+ pr_err("Failed to get clock");
+ return PTR_ERR(clk);
+ }
+
+ ret = clk_prepare_enable(clk);
+ if (ret)
+ return ret;

- BUG_ON(IS_ERR(clk));
- clk_prepare_enable(clk);
timer_clk = clk_get_rate(clk) / TIMER_DIVIDER;
timer25Mhz = false;

- armada_370_xp_timer_common_init(np);
+ return armada_370_xp_timer_common_init(np);
}
-CLOCKSOURCE_OF_DECLARE(armada_370, "marvell,armada-370-timer",
+CLOCKSOURCE_OF_DECLARE_RET(armada_370, "marvell,armada-370-timer",
armada_370_timer_init);
--
1.9.1
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