clocksource/drivers/oxnas-rps: 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>
Acked-by: Neil Armstrong <narmstrong@baylibre.com>

diff --git a/drivers/clocksource/timer-oxnas-rps.c b/drivers/clocksource/timer-oxnas-rps.c
index c002e99..0d99f40 100644 (file)
--- a/drivers/clocksource/timer-oxnas-rps.c
+++ b/drivers/clocksource/timer-oxnas-rps.c
@@ -220,32 +220,37 @@ static int __init oxnas_rps_clocksource_init(struct oxnas_rps_timer *rps)
        return 0;
 }
 
-static void __init oxnas_rps_timer_init(struct device_node *np)
+static int __init oxnas_rps_timer_init(struct device_node *np)
 {
        struct oxnas_rps_timer *rps;
        void __iomem *base;
        int ret;
 
        rps = kzalloc(sizeof(*rps), GFP_KERNEL);
-       if (!rps) {
-               pr_err("Failed to allocate rps structure\n");
-               return;
-       }
+       if (!rps)
+               return -ENOMEM;
 
        rps->clk = of_clk_get(np, 0);
-       if (WARN_ON(IS_ERR(rps->clk)))
+       if (IS_ERR(rps->clk)) {
+               ret = PTR_ERR(rps->clk);
                goto err_alloc;
+       }
 
-       if (WARN_ON(clk_prepare_enable(rps->clk)))
+       ret = clk_prepare_enable(rps->clk);
+       if (ret)
                goto err_clk;
 
        base = of_iomap(np, 0);
-       if (WARN_ON(!base))
+       if (!base) {
+               ret = -ENXIO;
                goto err_clk_prepare;
+       }
 
        rps->irq = irq_of_parse_and_map(np, 0);
-       if (WARN_ON(rps->irq < 0))
+       if (rps->irq < 0) {
+               ret = -EINVAL;
                goto err_iomap;
+       }
 
        rps->clkevt_base = base + TIMER1_REG_OFFSET;
        rps->clksrc_base = base + TIMER2_REG_OFFSET;
@@ -261,7 +266,7 @@ static void __init oxnas_rps_timer_init(struct device_node *np)
        ret = request_irq(rps->irq, oxnas_rps_timer_irq,
                          IRQF_TIMER | IRQF_IRQPOLL,
                          "rps-timer", rps);
-       if (WARN_ON(ret))
+       if (ret)
                goto err_iomap;
 
        ret = oxnas_rps_clocksource_init(rps);
@@ -272,7 +277,7 @@ static void __init oxnas_rps_timer_init(struct device_node *np)
        if (ret)
                goto err_irqreq;
 
-       return;
+       return 0;
 
 err_irqreq:
        free_irq(rps->irq, rps);
@@ -284,7 +289,9 @@ err_clk:
        clk_put(rps->clk);
 err_alloc:
        kfree(rps);
+
+       return ret;
 }
 
-CLOCKSOURCE_OF_DECLARE(ox810se_rps,
-                      "oxsemi,ox810se-rps-timer", oxnas_rps_timer_init);
+CLOCKSOURCE_OF_DECLARE_RET(ox810se_rps,
+                          "oxsemi,ox810se-rps-timer", oxnas_rps_timer_init);