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author | Daniel Lezcano <daniel.lezcano@linaro.org> | 2016-06-07 00:03:34 +0200 |
---|---|---|
committer | Daniel Lezcano <daniel.lezcano@linaro.org> | 2016-06-28 10:19:33 +0200 |
commit | 0586421746ef2bc33898d2d7f3dbb0eec6b234c3 (patch) | |
tree | f8843bea7a357c4c3db2b682b5663af491f5cc8f /arch/microblaze/kernel | |
parent | 42452508bd7a6527221fff84f3da2b0197b726ae (diff) | |
download | linux-0586421746ef2bc33898d2d7f3dbb0eec6b234c3.tar.gz linux-0586421746ef2bc33898d2d7f3dbb0eec6b234c3.tar.bz2 linux-0586421746ef2bc33898d2d7f3dbb0eec6b234c3.zip |
clocksource/drivers/microblaze: 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>
Diffstat (limited to 'arch/microblaze/kernel')
-rw-r--r-- | arch/microblaze/kernel/timer.c | 51 |
1 files changed, 38 insertions, 13 deletions
diff --git a/arch/microblaze/kernel/timer.c b/arch/microblaze/kernel/timer.c index 67e2ef48d2d0..7f35e7b50f1b 100644 --- a/arch/microblaze/kernel/timer.c +++ b/arch/microblaze/kernel/timer.c @@ -170,7 +170,7 @@ static struct irqaction timer_irqaction = { .dev_id = &clockevent_xilinx_timer, }; -static __init void xilinx_clockevent_init(void) +static __init int xilinx_clockevent_init(void) { clockevent_xilinx_timer.mult = div_sc(timer_clock_freq, NSEC_PER_SEC, @@ -181,6 +181,8 @@ static __init void xilinx_clockevent_init(void) clockevent_delta2ns(1, &clockevent_xilinx_timer); clockevent_xilinx_timer.cpumask = cpumask_of(0); clockevents_register_device(&clockevent_xilinx_timer); + + return 0; } static u64 xilinx_clock_read(void) @@ -229,8 +231,14 @@ static struct clocksource clocksource_microblaze = { static int __init xilinx_clocksource_init(void) { - if (clocksource_register_hz(&clocksource_microblaze, timer_clock_freq)) - panic("failed to register clocksource"); + int ret; + + ret = clocksource_register_hz(&clocksource_microblaze, + timer_clock_freq); + if (ret) { + pr_err("failed to register clocksource"); + return ret; + } /* stop timer1 */ write_fn(read_fn(timer_baseaddr + TCSR1) & ~TCSR_ENT, @@ -239,16 +247,16 @@ static int __init xilinx_clocksource_init(void) write_fn(TCSR_TINT|TCSR_ENT|TCSR_ARHT, timer_baseaddr + TCSR1); /* register timecounter - for ftrace support */ - init_xilinx_timecounter(); - return 0; + return init_xilinx_timecounter(); } -static void __init xilinx_timer_init(struct device_node *timer) +static int __init xilinx_timer_init(struct device_node *timer) { struct clk *clk; static int initialized; u32 irq; u32 timer_num = 1; + int ret; if (initialized) return; @@ -258,7 +266,7 @@ static void __init xilinx_timer_init(struct device_node *timer) timer_baseaddr = of_iomap(timer, 0); if (!timer_baseaddr) { pr_err("ERROR: invalid timer base address\n"); - BUG(); + return -ENXIO; } write_fn = timer_write32; @@ -271,11 +279,15 @@ static void __init xilinx_timer_init(struct device_node *timer) } irq = irq_of_parse_and_map(timer, 0); + if (irq <= 0) { + pr_err("Failed to parse and map irq"); + return -EINVAL; + } of_property_read_u32(timer, "xlnx,one-timer-only", &timer_num); if (timer_num) { - pr_emerg("Please enable two timers in HW\n"); - BUG(); + pr_err("Please enable two timers in HW\n"); + return -EINVAL; } pr_info("%s: irq=%d\n", timer->full_name, irq); @@ -297,15 +309,28 @@ static void __init xilinx_timer_init(struct device_node *timer) freq_div_hz = timer_clock_freq / HZ; - setup_irq(irq, &timer_irqaction); + ret = setup_irq(irq, &timer_irqaction); + if (ret) { + pr_err("Failed to setup IRQ"); + return ret; + } + #ifdef CONFIG_HEART_BEAT microblaze_setup_heartbeat(); #endif - xilinx_clocksource_init(); - xilinx_clockevent_init(); + + ret = xilinx_clocksource_init(); + if (ret) + return ret; + + ret = xilinx_clockevent_init(); + if (ret) + return ret; sched_clock_register(xilinx_clock_read, 32, timer_clock_freq); + + return 0; } -CLOCKSOURCE_OF_DECLARE(xilinx_timer, "xlnx,xps-timer-1.00.a", +CLOCKSOURCE_OF_DECLARE_RET(xilinx_timer, "xlnx,xps-timer-1.00.a", xilinx_timer_init); |