clocksource/drivers/arm_global_timer: 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: Maxime Coquelin <maxime.coquelin@st.com>

1 files changed, 18 insertions, 10 deletions

diff --git a/drivers/clocksource/arm_global_timer.c b/drivers/clocksource/arm_global_timer.c
index 9df0d1699d22..40104fc93f24 100644
--- a/drivers/clocksource/arm_global_timer.c
+++ b/drivers/clocksource/arm_global_timer.c
@@ -238,7 +238,7 @@ static void __init gt_delay_timer_init(void)
         register_current_timer_delay(&gt_delay_timer);
 }
 
-static void __init gt_clocksource_init(void)
+static int __init gt_clocksource_init(void)
 {
         writel(0, gt_base + GT_CONTROL);
         writel(0, gt_base + GT_COUNTER0);
@@ -249,7 +249,7 @@ static void __init gt_clocksource_init(void)
 #ifdef CONFIG_CLKSRC_ARM_GLOBAL_TIMER_SCHED_CLOCK
         sched_clock_register(gt_sched_clock_read, 64, gt_clk_rate);
 #endif
-        clocksource_register_hz(&gt_clocksource, gt_clk_rate);
+        return clocksource_register_hz(&gt_clocksource, gt_clk_rate);
 }
 
 static int gt_cpu_notify(struct notifier_block *self, unsigned long action,
@@ -270,7 +270,7 @@ static struct notifier_block gt_cpu_nb = {
         .notifier_call = gt_cpu_notify,
 };
 
-static void __init global_timer_of_register(struct device_node *np)
+static int __init global_timer_of_register(struct device_node *np)
 {
         struct clk *gt_clk;
         int err = 0;
@@ -283,19 +283,19 @@ static void __init global_timer_of_register(struct device_node *np)
         if (read_cpuid_part() == ARM_CPU_PART_CORTEX_A9
             && (read_cpuid_id() & 0xf0000f) < 0x200000) {
                 pr_warn("global-timer: non support for this cpu version.\n");
-                return;
+                return -ENOSYS;
         }
 
         gt_ppi = irq_of_parse_and_map(np, 0);
         if (!gt_ppi) {
                 pr_warn("global-timer: unable to parse irq\n");
-                return;
+                return -EINVAL;
         }
 
         gt_base = of_iomap(np, 0);
         if (!gt_base) {
                 pr_warn("global-timer: invalid base address\n");
-                return;
+                return -ENXIO;
         }
 
         gt_clk = of_clk_get(np, 0);
@@ -332,11 +332,17 @@ static void __init global_timer_of_register(struct device_node *np)
         }
 
         /* Immediately configure the timer on the boot CPU */
-        gt_clocksource_init();
-        gt_clockevents_init(this_cpu_ptr(gt_evt));
+        err = gt_clocksource_init();
+        if (err)
+                goto out_irq;
+        
+        err = gt_clockevents_init(this_cpu_ptr(gt_evt));
+        if (err)
+                goto out_irq;
+
         gt_delay_timer_init();
 
-        return;
+        return 0;
 
 out_irq:
         free_percpu_irq(gt_ppi, gt_evt);
@@ -347,8 +353,10 @@ out_clk:
 out_unmap:
         iounmap(gt_base);
         WARN(err, "ARM Global timer register failed (%d)\n", err);
+
+        return err;
 }
 
 /* Only tested on r2p2 and r3p0  */
-CLOCKSOURCE_OF_DECLARE(arm_gt, "arm,cortex-a9-global-timer",
+CLOCKSOURCE_OF_DECLARE_RET(arm_gt, "arm,cortex-a9-global-timer",
                         global_timer_of_register);