linux-kernel - [PATCH] leds: add hibernation callbacks

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Date:	Mon,  2 Feb 2015 18:33:06 +0200
From:	<grygorii.strashko@...aro.org>
To:	Bryan Wu <cooloney@...il.com>, Richard Purdie <rpurdie@...ys.net>,
	linux-leds@...r.kernel.org
Cc:	sumit.semwal@...aro.org, linux-arm-kernel@...ts.infradead.org,
	<linux-kernel@...r.kernel.org>, linux-pm@...r.kernel.org,
	Grygorii Strashko <Grygorii.Strashko@...aro.org>
Subject: [PATCH] leds: add hibernation callbacks

From: Grygorii Strashko <Grygorii.Strashko@...aro.org>

Setting a dev_pm_ops suspend/resume pair of callbacks but not a set of
hibernation callbacks means those pm functions will not be
called upon hibernation - that leads to system crash on ARM during
freezing if gpio-led is used in combination with CPU led trigger.
It may happen after freeze_noirq stage (GPIO is suspended)
and before syscore_suspend stage (CPU led trigger is suspended)
- usually when disable_nonboot_cpus() is called.

Fix this by using SIMPLE_DEV_PM_OPS, which appropriately
assigns the suspend and hibernation callbacks.

Signed-off-by: Grygorii Strashko <Grygorii.Strashko@...aro.org>
---
 drivers/leds/led-class.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/leds/led-class.c b/drivers/leds/led-class.c
index f37d63c..4c03808 100644
--- a/drivers/leds/led-class.c
+++ b/drivers/leds/led-class.c
@@ -198,10 +198,7 @@ static int led_resume(struct device *dev)
 	return 0;
 }
 
-static const struct dev_pm_ops leds_class_dev_pm_ops = {
-	.suspend        = led_suspend,
-	.resume         = led_resume,
-};
+static SIMPLE_DEV_PM_OPS(leds_class_dev_pm_ops, led_suspend, led_resume);
 
 /**
  * led_classdev_register - register a new object of led_classdev class.
-- 
1.9.1

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