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Commit 5e558ebd authored by Daniel Lezcano's avatar Daniel Lezcano
Browse files

clocksource/drivers/exynos_mct: 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: default avatarDaniel Lezcano <daniel.lezcano@linaro.org>
Reviewed-by: default avatarKrzysztof Kozlowski <k.kozlowski@samsung.com>
parent d64e24ce

drivers/clocksource/exynos_mct.c

+24 −12
Original line number Diff line number Diff line
@@ -232,7 +232,7 @@ static cycles_t exynos4_read_current_timer(void) 
	return exynos4_read_count_32();

}



static void __init exynos4_clocksource_init(void)

static int __init exynos4_clocksource_init(void)

{

	exynos4_mct_frc_start();
@@ -244,6 +244,8 @@ static void __init exynos4_clocksource_init(void) 
		panic("%s: can't register clocksource\n", mct_frc.name);



	sched_clock_register(exynos4_read_sched_clock, 32, clk_rate);



	return 0;

}



static void exynos4_mct_comp0_stop(void)
@@ -335,12 +337,14 @@ static struct irqaction mct_comp_event_irq = { 
	.dev_id		= &mct_comp_device,

};



static void exynos4_clockevent_init(void)

static int exynos4_clockevent_init(void)

{

	mct_comp_device.cpumask = cpumask_of(0);

	clockevents_config_and_register(&mct_comp_device, clk_rate,

					0xf, 0xffffffff);

	setup_irq(mct_irqs[MCT_G0_IRQ], &mct_comp_event_irq);



	return 0;

}



static DEFINE_PER_CPU(struct mct_clock_event_device, percpu_mct_tick);
@@ -516,7 +520,7 @@ static struct notifier_block exynos4_mct_cpu_nb = { 
	.notifier_call = exynos4_mct_cpu_notify,

};



static void __init exynos4_timer_resources(struct device_node *np, void __iomem *base)

static int __init exynos4_timer_resources(struct device_node *np, void __iomem *base)

{

	int err, cpu;

	struct mct_clock_event_device *mevt = this_cpu_ptr(&percpu_mct_tick);
@@ -572,15 +576,17 @@ static void __init exynos4_timer_resources(struct device_node *np, void __iomem 


	/* Immediately configure the timer on the boot CPU */

	exynos4_local_timer_setup(mevt);

	return;

	return 0;



out_irq:

	free_percpu_irq(mct_irqs[MCT_L0_IRQ], &percpu_mct_tick);

	return err;

}



static void __init mct_init_dt(struct device_node *np, unsigned int int_type)

static int __init mct_init_dt(struct device_node *np, unsigned int int_type)

{

	u32 nr_irqs, i;

	int ret;



	mct_int_type = int_type;
@@ -600,20 +606,26 @@ static void __init mct_init_dt(struct device_node *np, unsigned int int_type) 
	for (i = MCT_L0_IRQ; i < nr_irqs; i++)

		mct_irqs[i] = irq_of_parse_and_map(np, i);



	exynos4_timer_resources(np, of_iomap(np, 0));

	exynos4_clocksource_init();

	exynos4_clockevent_init();

	ret = exynos4_timer_resources(np, of_iomap(np, 0));

	if (ret)

		return ret;



	ret = exynos4_clocksource_init();

	if (ret)

		return ret;



	return exynos4_clockevent_init();

}





static void __init mct_init_spi(struct device_node *np)

static int __init mct_init_spi(struct device_node *np)

{

	return mct_init_dt(np, MCT_INT_SPI);

}



static void __init mct_init_ppi(struct device_node *np)

static int __init mct_init_ppi(struct device_node *np)

{

	return mct_init_dt(np, MCT_INT_PPI);

}

CLOCKSOURCE_OF_DECLARE(exynos4210, "samsung,exynos4210-mct", mct_init_spi);

CLOCKSOURCE_OF_DECLARE(exynos4412, "samsung,exynos4412-mct", mct_init_ppi);
 
CLOCKSOURCE_OF_DECLARE_RET(exynos4210, "samsung,exynos4210-mct", mct_init_spi);

CLOCKSOURCE_OF_DECLARE_RET(exynos4412, "samsung,exynos4412-mct", mct_init_ppi);