linux-kernel - [PATCH] leds: make sure led->trigger is valid before calling trigger->activate

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Date:	Thu, 19 Jun 2008 15:48:47 +0400
From:	Dmitry Baryshkov <dbaryshkov@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	rpurdie@...ys.net
Subject: [PATCH] leds: make sure led->trigger is valid before calling
	trigger->activate

Signed-off-by: Dmitry Baryshkov <dbaryshkov@...il.com>
---
 drivers/leds/led-triggers.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/leds/led-triggers.c b/drivers/leds/led-triggers.c
index 0f242b3..f910eaf 100644
--- a/drivers/leds/led-triggers.c
+++ b/drivers/leds/led-triggers.c
@@ -111,16 +111,17 @@ void led_trigger_set(struct led_classdev *led_cdev, struct led_trigger *trigger)
 			flags);
 		if (led_cdev->trigger->deactivate)
 			led_cdev->trigger->deactivate(led_cdev);
+		led_cdev->trigger = NULL;
 		led_set_brightness(led_cdev, LED_OFF);
 	}
 	if (trigger) {
 		write_lock_irqsave(&trigger->leddev_list_lock, flags);
 		list_add_tail(&led_cdev->trig_list, &trigger->led_cdevs);
 		write_unlock_irqrestore(&trigger->leddev_list_lock, flags);
+		led_cdev->trigger = trigger;
 		if (trigger->activate)
 			trigger->activate(led_cdev);
 	}
-	led_cdev->trigger = trigger;
 }
 EXPORT_SYMBOL_GPL(led_trigger_set);
 
-- 
1.5.5.3


-- 
With best wishes
Dmitry

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