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author | Daniel Lezcano <daniel.lezcano@linaro.org> | 2016-06-06 23:29:18 +0200 |
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committer | Daniel Lezcano <daniel.lezcano@linaro.org> | 2016-06-28 10:19:32 +0200 |
commit | 1ee078facfd4f26f516becd4c73a7e6a2e520965 (patch) | |
tree | a2d28497170e53c7f4e5e81566a1b17f1290e915 /drivers/clocksource | |
parent | 0a8e7d49d59ce3910dd341d0d3df419f8defc9fe (diff) | |
download | linux-stable-1ee078facfd4f26f516becd4c73a7e6a2e520965.tar.gz linux-stable-1ee078facfd4f26f516becd4c73a7e6a2e520965.tar.bz2 linux-stable-1ee078facfd4f26f516becd4c73a7e6a2e520965.zip |
clocksource/drivers/u300: Convert init function to return error
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>
Diffstat (limited to 'drivers/clocksource')
-rw-r--r-- | drivers/clocksource/timer-u300.c | 38 |
1 files changed, 27 insertions, 11 deletions
diff --git a/drivers/clocksource/timer-u300.c b/drivers/clocksource/timer-u300.c index 1744b243898a..a6a0dec41faa 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); |