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leds: Fix led trigger locking bugs

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Convert part of the led trigger core from rw spinlocks to rw
semaphores. We're calling functions which can sleep from invalid
contexts otherwise. Fixes bug #9264.

Signed-off-by: Richard Purdie <rpurdie@rpsys.net>
This commit is contained in:
Richard Purdie
2007-11-10 13:29:04 +00:00
parent f194d132e4
commit dc47206e55
3 changed files with 30 additions and 28 deletions
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6
drivers/leds/led-class.c
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@@ -111,7 +111,7 @@ int led_classdev_register(struct device *parent, struct led_classdev *led_cdev)
write_unlock(&leds_list_lock);
#ifdef CONFIG_LEDS_TRIGGERS
rwlock_init(&led_cdev->trigger_lock);
init_rwsem(&led_cdev->trigger_lock);
rc = device_create_file(led_cdev->dev, &dev_attr_trigger);
if (rc)
@@ -147,10 +147,10 @@ void led_classdev_unregister(struct led_classdev *led_cdev)
device_remove_file(led_cdev->dev, &dev_attr_brightness);
#ifdef CONFIG_LEDS_TRIGGERS
device_remove_file(led_cdev->dev, &dev_attr_trigger);
write_lock(&led_cdev->trigger_lock);
down_write(&led_cdev->trigger_lock);
if (led_cdev->trigger)
led_trigger_set(led_cdev, NULL);
write_unlock(&led_cdev->trigger_lock);
up_write(&led_cdev->trigger_lock);
#endif
device_unregister(led_cdev->dev);