From be3aff842d646f64c1c82e3ee8a0ba14c0319a30 Mon Sep 17 00:00:00 2001 From: Daniel Lezcano Date: Mon, 6 Jun 2016 17:58:27 +0200 Subject: [PATCH] clocksource/drivers/pxa: 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 --- drivers/clocksource/pxa_timer.c | 46 +++++++++++++++++++++++---------- 1 file changed, 33 insertions(+), 13 deletions(-) diff --git a/drivers/clocksource/pxa_timer.c b/drivers/clocksource/pxa_timer.c index 45b6a4999713..59af75cc4c74 100644 --- a/drivers/clocksource/pxa_timer.c +++ b/drivers/clocksource/pxa_timer.c @@ -150,8 +150,10 @@ static struct irqaction pxa_ost0_irq = { .dev_id = &ckevt_pxa_osmr0, }; -static void __init pxa_timer_common_init(int irq, unsigned long clock_tick_rate) +static int __init pxa_timer_common_init(int irq, unsigned long clock_tick_rate) { + int ret; + timer_writel(0, OIER); timer_writel(OSSR_M0 | OSSR_M1 | OSSR_M2 | OSSR_M3, OSSR); @@ -159,41 +161,59 @@ static void __init pxa_timer_common_init(int irq, unsigned long clock_tick_rate) ckevt_pxa_osmr0.cpumask = cpumask_of(0); - setup_irq(irq, &pxa_ost0_irq); + ret = setup_irq(irq, &pxa_ost0_irq); + if (ret) { + pr_err("Failed to setup irq"); + return ret; + } + + ret = clocksource_mmio_init(timer_base + OSCR, "oscr0", clock_tick_rate, 200, + 32, clocksource_mmio_readl_up); + if (ret) { + pr_err("Failed to init clocksource"); + return ret; + } - clocksource_mmio_init(timer_base + OSCR, "oscr0", clock_tick_rate, 200, - 32, clocksource_mmio_readl_up); clockevents_config_and_register(&ckevt_pxa_osmr0, clock_tick_rate, MIN_OSCR_DELTA * 2, 0x7fffffff); + + return 0; } -static void __init pxa_timer_dt_init(struct device_node *np) +static int __init pxa_timer_dt_init(struct device_node *np) { struct clk *clk; - int irq; + int irq, ret; /* timer registers are shared with watchdog timer */ timer_base = of_iomap(np, 0); - if (!timer_base) - panic("%s: unable to map resource\n", np->name); + if (!timer_base) { + pr_err("%s: unable to map resource\n", np->name); + return -ENXIO; + } clk = of_clk_get(np, 0); if (IS_ERR(clk)) { pr_crit("%s: unable to get clk\n", np->name); - return; + return PTR_ERR(clk); + } + + ret = clk_prepare_enable(clk); + if (ret) { + pr_crit("Failed to prepare clock"); + return ret; } - clk_prepare_enable(clk); /* we are only interested in OS-timer0 irq */ irq = irq_of_parse_and_map(np, 0); if (irq <= 0) { pr_crit("%s: unable to parse OS-timer0 irq\n", np->name); - return; + return -EINVAL; } - pxa_timer_common_init(irq, clk_get_rate(clk)); + return pxa_timer_common_init(irq, clk_get_rate(clk)); } -CLOCKSOURCE_OF_DECLARE(pxa_timer, "marvell,pxa-timer", pxa_timer_dt_init); +CLOCKSOURCE_OF_DECLARE_RET(pxa_timer, "marvell,pxa-timer", pxa_timer_dt_init); /* * Legacy timer init for non device-tree boards.