diff mbox

[V2,14/63] clocksource/drivers/bcm_kona: Convert init function to return error

Message ID 1466112442-31105-15-git-send-email-daniel.lezcano@linaro.org
State Superseded
Headers show

Commit Message

Daniel Lezcano June 16, 2016, 9:26 p.m. UTC 
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>

---
 drivers/clocksource/bcm_kona_timer.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

-- 
1.9.1

Comments

Daniel Lezcano June 20, 2016, 5:40 p.m. UTC | #1 
On 06/20/2016 07:22 PM, Ray Jui wrote:

[ ... ]

>> -static void __init kona_timer_init(struct device_node *node)

>> +static int __init kona_timer_init(struct device_node *node)

>>  {

>>      u32 freq;

>>      struct clk *external_clk;

>>

>>      if (!of_device_is_available(node)) {

>>          pr_info("Kona Timer v1 marked as disabled in device tree\n");

>> -        return;

>> +        return 0;

>

> I thought we should return -ENODEV here.

>

> Moreover, if this device node is not enabled, kona_timer_init won't even

> be invoked. Can we simply get rid of this check here?


Yes, absolutely :)



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diff mbox

Patch

diff --git a/drivers/clocksource/bcm_kona_timer.c b/drivers/clocksource/bcm_kona_timer.c
index e717e87..98bc2a2 100644
--- a/drivers/clocksource/bcm_kona_timer.c
+++ b/drivers/clocksource/bcm_kona_timer.c
@@ -163,14 +163,14 @@  static struct irqaction kona_timer_irq = {
 	.handler = kona_timer_interrupt,
 };
 
-static void __init kona_timer_init(struct device_node *node)
+static int __init kona_timer_init(struct device_node *node)
 {
 	u32 freq;
 	struct clk *external_clk;
 
 	if (!of_device_is_available(node)) {
 		pr_info("Kona Timer v1 marked as disabled in device tree\n");
-		return;
+		return 0;
 	}
 
 	external_clk = of_clk_get_by_name(node, NULL);
@@ -182,7 +182,7 @@  static void __init kona_timer_init(struct device_node *node)
 		arch_timer_rate = freq;
 	} else {
 		pr_err("Kona Timer v1 unable to determine clock-frequency");
-		return;
+		return -EINVAL;
 	}
 
 	/* Setup IRQ numbers */
@@ -196,11 +196,13 @@  static void __init kona_timer_init(struct device_node *node)
 	kona_timer_clockevents_init();
 	setup_irq(timers.tmr_irq, &kona_timer_irq);
 	kona_timer_set_next_event((arch_timer_rate / HZ), NULL);
+
+	return 0;
 }
 
-CLOCKSOURCE_OF_DECLARE(brcm_kona, "brcm,kona-timer", kona_timer_init);
+CLOCKSOURCE_OF_DECLARE_RET(brcm_kona, "brcm,kona-timer", kona_timer_init);
 /*
  * bcm,kona-timer is deprecated by brcm,kona-timer
  * being kept here for driver compatibility
  */
-CLOCKSOURCE_OF_DECLARE(bcm_kona, "bcm,kona-timer", kona_timer_init);
+CLOCKSOURCE_OF_DECLARE_RET(bcm_kona, "bcm,kona-timer", kona_timer_init);