[PATCH V2 42/63] clocksource/drivers/prima2: Convert init function to return error
From: Daniel Lezcano <hidden>
Date: 2016-06-16 21:34:51
Also in:
lkml
Subsystem:
clocksource, clockevent drivers, the rest · Maintainers:
Daniel Lezcano, Thomas Gleixner, Linus Torvalds
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 <redacted>
---
drivers/clocksource/timer-prima2.c | 43 ++++++++++++++++++++++++++++----------
1 file changed, 32 insertions(+), 11 deletions(-)
diff --git a/drivers/clocksource/timer-prima2.c b/drivers/clocksource/timer-prima2.c
index 2854c66..7b1084d 100644
--- a/drivers/clocksource/timer-prima2.c
+++ b/drivers/clocksource/timer-prima2.c@@ -189,24 +189,36 @@ static void __init sirfsoc_clockevent_init(void) } /* initialize the kernel jiffy timer source */ -static void __init sirfsoc_prima2_timer_init(struct device_node *np) +static int __init sirfsoc_prima2_timer_init(struct device_node *np) { unsigned long rate; struct clk *clk; + int ret; clk = of_clk_get(np, 0); - BUG_ON(IS_ERR(clk)); + if (IS_ERR(clk)) { + pr_err("Failed to get clock"); + return PTR_ERR(clk); + } - BUG_ON(clk_prepare_enable(clk)); + ret = clk_prepare_enable(clk); + if (ret) { + pr_err("Failed to enable clock"); + return ret; + } rate = clk_get_rate(clk); - BUG_ON(rate < PRIMA2_CLOCK_FREQ); - BUG_ON(rate % PRIMA2_CLOCK_FREQ); + if (rate < PRIMA2_CLOCK_FREQ || rate % PRIMA2_CLOCK_FREQ) { + pr_err("Invalid clock rate"); + return -EINVAL; + } sirfsoc_timer_base = of_iomap(np, 0); - if (!sirfsoc_timer_base) - panic("unable to map timer cpu registers\n"); + if (!sirfsoc_timer_base) { + pr_err("unable to map timer cpu registers\n"); + return -ENXIO; + } sirfsoc_timer_irq.irq = irq_of_parse_and_map(np, 0);
@@ -216,14 +228,23 @@ static void __init sirfsoc_prima2_timer_init(struct device_node *np) writel_relaxed(0, sirfsoc_timer_base + SIRFSOC_TIMER_COUNTER_HI); writel_relaxed(BIT(0), sirfsoc_timer_base + SIRFSOC_TIMER_STATUS); - BUG_ON(clocksource_register_hz(&sirfsoc_clocksource, - PRIMA2_CLOCK_FREQ)); + ret = clocksource_register_hz(&sirfsoc_clocksource, PRIMA2_CLOCK_FREQ); + if (ret) { + pr_err("Failed to register clocksource"); + return ret; + } sched_clock_register(sirfsoc_read_sched_clock, 64, PRIMA2_CLOCK_FREQ); - BUG_ON(setup_irq(sirfsoc_timer_irq.irq, &sirfsoc_timer_irq)); + ret = setup_irq(sirfsoc_timer_irq.irq, &sirfsoc_timer_irq); + if (ret) { + pr_err("Failed to setup irq"); + return ret; + } sirfsoc_clockevent_init(); + + return 0; } -CLOCKSOURCE_OF_DECLARE(sirfsoc_prima2_timer, +CLOCKSOURCE_OF_DECLARE_RET(sirfsoc_prima2_timer, "sirf,prima2-tick", sirfsoc_prima2_timer_init);
--
1.9.1