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 <daniel.lezcano@linaro.org>

diff --git a/drivers/clocksource/pxa_timer.c b/drivers/clocksource/pxa_timer.c
index 45b6a49997137beb7f67877a682a19c2066fffe6..59af75cc4c745da65d06c58d4d2c5f932b0ecbd9 100644 (file)
--- 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.