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clocksource/drivers/atmel-pit: 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>
This commit is contained in:
Daniel Lezcano 2016-06-06 19:10:55 +02:00
parent c41c96ddac
commit 504f34c9e4
1 changed files with 29 additions and 14 deletions
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43
drivers/clocksource/timer-atmel-pit.c
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@ -177,7 +177,7 @@ static irqreturn_t at91sam926x_pit_interrupt(int irq, void *dev_id)
/*
* Set up both clocksource and clockevent support.
*/
static void __init at91sam926x_pit_common_init(struct pit_data *data)
static int __init at91sam926x_pit_common_init(struct pit_data *data)
{
unsigned long pit_rate;
unsigned bits;
@ -204,14 +204,21 @@ static void __init at91sam926x_pit_common_init(struct pit_data *data)
data->clksrc.rating = 175;
data->clksrc.read = read_pit_clk;
data->clksrc.flags = CLOCK_SOURCE_IS_CONTINUOUS;
clocksource_register_hz(&data->clksrc, pit_rate);
ret = clocksource_register_hz(&data->clksrc, pit_rate);
if (ret) {
pr_err("Failed to register clocksource");
return ret;
}
/* Set up irq handler */
ret = request_irq(data->irq, at91sam926x_pit_interrupt,
IRQF_SHARED | IRQF_TIMER | IRQF_IRQPOLL,
"at91_tick", data);
if (ret)
panic(pr_fmt("Unable to setup IRQ\n"));
if (ret) {
pr_err("Unable to setup IRQ\n");
return ret;
}
/* Set up and register clockevents */
data->clkevt.name = "pit";
@ -226,34 +233,42 @@ static void __init at91sam926x_pit_common_init(struct pit_data *data)
data->clkevt.resume = at91sam926x_pit_resume;
data->clkevt.suspend = at91sam926x_pit_suspend;
clockevents_register_device(&data->clkevt);
return 0;
}
static void __init at91sam926x_pit_dt_init(struct device_node *node)
static int __init at91sam926x_pit_dt_init(struct device_node *node)
{
struct pit_data *data;
data = kzalloc(sizeof(*data), GFP_KERNEL);
if (!data)
panic(pr_fmt("Unable to allocate memory\n"));
return -ENOMEM;
data->base = of_iomap(node, 0);
if (!data->base)
panic(pr_fmt("Could not map PIT address\n"));
if (!data->base) {
pr_err("Could not map PIT address\n");
return -ENXIO;
}
data->mck = of_clk_get(node, 0);
if (IS_ERR(data->mck))
/* Fallback on clkdev for !CCF-based boards */
data->mck = clk_get(NULL, "mck");
if (IS_ERR(data->mck))
panic(pr_fmt("Unable to get mck clk\n"));
if (IS_ERR(data->mck)) {
pr_err("Unable to get mck clk\n");
return PTR_ERR(data->mck);
}
/* Get the interrupts property */
data->irq = irq_of_parse_and_map(node, 0);
if (!data->irq)
panic(pr_fmt("Unable to get IRQ from DT\n"));
if (!data->irq) {
pr_err("Unable to get IRQ from DT\n");
return -EINVAL;
}
at91sam926x_pit_common_init(data);
return at91sam926x_pit_common_init(data);
}
CLOCKSOURCE_OF_DECLARE(at91sam926x_pit, "atmel,at91sam9260-pit",
CLOCKSOURCE_OF_DECLARE_RET(at91sam926x_pit, "atmel,at91sam9260-pit",
at91sam926x_pit_dt_init);