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74 lines
2.2 KiB
Diff
74 lines
2.2 KiB
Diff
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From 8279b4e4862b148b10e7d4d2967ac92eaae0f129 Mon Sep 17 00:00:00 2001
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From: Holger Freyther <zecke@openmoko.org>
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Date: Fri, 25 Jul 2008 23:06:18 +0100
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Subject: [PATCH] From 3a32be40f78404d5f1185f0b3d6b5632381cb33f Mon Sep 17 00:00:00 2001
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Subject: [PATCH] [neo1973 leds] Move from mutex to spinlock because we may not use mutexes
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The led triggers may call set_brightness from atomic contexts. As
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mutex_lock calls might_sleep and sleeping is not allowed in atomic contexts
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we have to switch to spinlocks here.
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Signed-Off-By: Holger Freyther <zecke@openmoko.org>
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---
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drivers/leds/leds-neo1973-gta02.c | 10 +++++-----
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1 files changed, 5 insertions(+), 5 deletions(-)
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diff --git a/drivers/leds/leds-neo1973-gta02.c b/drivers/leds/leds-neo1973-gta02.c
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index 952ad69..8fe817b 100644
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--- a/drivers/leds/leds-neo1973-gta02.c
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+++ b/drivers/leds/leds-neo1973-gta02.c
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@@ -27,7 +27,7 @@
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struct gta02_led_priv
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{
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- struct mutex mutex;
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+ spinlock_t lock;
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struct led_classdev cdev;
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struct s3c2410_pwm pwm;
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unsigned int gpio;
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@@ -53,6 +53,7 @@ static inline struct gta02_led_bundle *to_bundle(struct led_classdev *led_cdev)
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static void gta02led_set(struct led_classdev *led_cdev,
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enum led_brightness value)
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{
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+ unsigned long flags;
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struct gta02_led_priv *lp = to_priv(led_cdev);
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/*
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@@ -60,7 +61,7 @@ static void gta02led_set(struct led_classdev *led_cdev,
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* value == 128 -> 50% duty cycle (medium power)
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* value == 0 -> 0% duty cycle (zero power)
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*/
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- mutex_lock(&lp->mutex);
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+ spin_lock_irqsave(&lp->lock, flags);
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if (lp->has_pwm) {
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s3c2410_pwm_duty_cycle(value, &lp->pwm);
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@@ -68,7 +69,7 @@ static void gta02led_set(struct led_classdev *led_cdev,
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neo1973_gpb_setpin(lp->gpio, value ? 1 : 0);
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}
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- mutex_unlock(&lp->mutex);
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+ spin_unlock_irqrestore(&lp->lock, flags);
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}
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#ifdef CONFIG_PM
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@@ -170,7 +171,7 @@ static int __init gta02led_probe(struct platform_device *pdev)
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break;
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}
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- mutex_init(&lp->mutex);
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+ spin_lock_init(&lp->lock);
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rc = led_classdev_register(&pdev->dev, &lp->cdev);
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}
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@@ -192,7 +193,6 @@ static int gta02led_remove(struct platform_device *pdev)
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gta02led_set(&lp->cdev, 0);
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led_classdev_unregister(&lp->cdev);
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- mutex_destroy(&lp->mutex);
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}
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platform_set_drvdata(pdev, NULL);
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--
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1.5.6.3
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