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Subject[PATCH V2 50/63] clocksource/drivers/timer-u300: 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-u300.c | 38 +++++++++++++++++++++++++++-----------
1 file changed, 27 insertions(+), 11 deletions(-)

diff --git a/drivers/clocksource/timer-u300.c b/drivers/clocksource/timer-u300.c
index 1744b24..a6a0dec 100644
--- a/drivers/clocksource/timer-u300.c
+++ b/drivers/clocksource/timer-u300.c
@@ -359,27 +359,37 @@ static struct delay_timer u300_delay_timer;
/*
* This sets up the system timers, clock source and clock event.
*/
-static void __init u300_timer_init_of(struct device_node *np)
+static int __init u300_timer_init_of(struct device_node *np)
{
unsigned int irq;
struct clk *clk;
unsigned long rate;
+ int ret;

u300_timer_base = of_iomap(np, 0);
- if (!u300_timer_base)
- panic("could not ioremap system timer\n");
+ if (!u300_timer_base) {
+ pr_err("could not ioremap system timer\n");
+ return -ENXIO;
+ }

/* Get the IRQ for the GP1 timer */
irq = irq_of_parse_and_map(np, 2);
- if (!irq)
- panic("no IRQ for system timer\n");
+ if (!irq) {
+ pr_err("no IRQ for system timer\n");
+ return -EINVAL;
+ }

pr_info("U300 GP1 timer @ base: %p, IRQ: %u\n", u300_timer_base, irq);

/* Clock the interrupt controller */
clk = of_clk_get(np, 0);
- BUG_ON(IS_ERR(clk));
- clk_prepare_enable(clk);
+ if (IS_ERR(clk))
+ return PTR_ERR(clk);
+
+ ret = clk_prepare_enable(clk);
+ if (ret)
+ return ret;
+
rate = clk_get_rate(clk);

u300_clockevent_data.ticks_per_jiffy = DIV_ROUND_CLOSEST(rate, HZ);
@@ -410,7 +420,9 @@ static void __init u300_timer_init_of(struct device_node *np)
u300_timer_base + U300_TIMER_APP_RGPT1);

/* Set up the IRQ handler */
- setup_irq(irq, &u300_timer_irq);
+ ret = setup_irq(irq, &u300_timer_irq);
+ if (ret)
+ return ret;

/* Reset the General Purpose timer 2 */
writel(U300_TIMER_APP_RGPT2_TIMER_RESET,
@@ -428,9 +440,12 @@ static void __init u300_timer_init_of(struct device_node *np)
u300_timer_base + U300_TIMER_APP_EGPT2);

/* Use general purpose timer 2 as clock source */
- if (clocksource_mmio_init(u300_timer_base + U300_TIMER_APP_GPT2CC,
- "GPT2", rate, 300, 32, clocksource_mmio_readl_up))
+ ret = clocksource_mmio_init(u300_timer_base + U300_TIMER_APP_GPT2CC,
+ "GPT2", rate, 300, 32, clocksource_mmio_readl_up);
+ if (ret) {
pr_err("timer: failed to initialize U300 clock source\n");
+ return ret;
+ }

/* Configure and register the clockevent */
clockevents_config_and_register(&u300_clockevent_data.cevd, rate,
@@ -440,7 +455,8 @@ static void __init u300_timer_init_of(struct device_node *np)
* TODO: init and register the rest of the timers too, they can be
* used by hrtimers!
*/
+ return 0;
}

-CLOCKSOURCE_OF_DECLARE(u300_timer, "stericsson,u300-apptimer",
+CLOCKSOURCE_OF_DECLARE_RET(u300_timer, "stericsson,u300-apptimer",
u300_timer_init_of);
--
1.9.1
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