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clocksource/drivers/u300: Convert init function to return error

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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>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Daniel Lezcano 2016-06-06 23:29:18 +02:00
parent 0a8e7d49d5
commit 1ee078facf
1 changed files with 27 additions and 11 deletions
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38
drivers/clocksource/timer-u300.c
View File

@ -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);