clocksource/drivers/tango_xtal: 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 leave the caller unaware of 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 returns an error code from the init function.

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Acked-by: Marc Gonzalez <marc_gonzalez@sigmadesigns.com>

diff --git a/drivers/clocksource/tango_xtal.c b/drivers/clocksource/tango_xtal.c
index c407c47a32326a568f11b2f586c8e29aa3588572..7dc716cc976fc274d98f35839af1c191b4f8ebad 100644 (file)
--- a/drivers/clocksource/tango_xtal.c
+++ b/drivers/clocksource/tango_xtal.c
@@ -19,7 +19,7 @@ static u64 notrace read_sched_clock(void)
        return read_xtal_counter();
 }
 
-static void __init tango_clocksource_init(struct device_node *np)
+static int __init tango_clocksource_init(struct device_node *np)
 {
        struct clk *clk;
        int xtal_freq, ret;
@@ -27,13 +27,13 @@ static void __init tango_clocksource_init(struct device_node *np)
        xtal_in_cnt = of_iomap(np, 0);
        if (xtal_in_cnt == NULL) {
                pr_err("%s: invalid address\n", np->full_name);
-               return;
+               return -ENXIO;
        }
 
        clk = of_clk_get(np, 0);
        if (IS_ERR(clk)) {
                pr_err("%s: invalid clock\n", np->full_name);
-               return;
+               return PTR_ERR(clk);
        }
 
        xtal_freq = clk_get_rate(clk);
@@ -44,11 +44,13 @@ static void __init tango_clocksource_init(struct device_node *np)
                                    32, clocksource_mmio_readl_up);
        if (ret) {
                pr_err("%s: registration failed\n", np->full_name);
-               return;
+               return ret;
        }
 
        sched_clock_register(read_sched_clock, 32, xtal_freq);
        register_current_timer_delay(&delay_timer);
+
+       return 0;
 }
 
-CLOCKSOURCE_OF_DECLARE(tango, "sigma,tick-counter", tango_clocksource_init);
+CLOCKSOURCE_OF_DECLARE_RET(tango, "sigma,tick-counter", tango_clocksource_init);