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authorLinus Torvalds <torvalds@woody.linux-foundation.org>2007-12-07 10:58:19 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-12-07 10:58:19 -0800
commitbbce0b5ca2884b44dbfffff77e876a90b4184516 (patch)
tree5d2caf13e0f8a7b8e3764f31c29f102c7964adc9
parent5fa2e1591300267b1e082c693d0b4da8e4943551 (diff)
parentdc47206e552c0850ad11f7e9a1fca0a3c92f5d65 (diff)
Merge branch 'for-linus' of git://git.o-hand.com/linux-rpurdie-leds
* 'for-linus' of git://git.o-hand.com/linux-rpurdie-leds: leds: Fix led trigger locking bugs
-rw-r--r--drivers/leds/led-class.c6
-rw-r--r--drivers/leds/led-triggers.c49
-rw-r--r--include/linux/leds.h3
3 files changed, 30 insertions, 28 deletions
diff --git a/drivers/leds/led-class.c b/drivers/leds/led-class.c
index 4211293ce86..ba8b04b03b9 100644
--- a/drivers/leds/led-class.c
+++ b/drivers/leds/led-class.c
@@ -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);
diff --git a/drivers/leds/led-triggers.c b/drivers/leds/led-triggers.c
index 575368c2b10..0bdb786210b 100644
--- a/drivers/leds/led-triggers.c
+++ b/drivers/leds/led-triggers.c
@@ -19,13 +19,14 @@
#include <linux/device.h>
#include <linux/sysdev.h>
#include <linux/timer.h>
+#include <linux/rwsem.h>
#include <linux/leds.h>
#include "leds.h"
/*
* Nests outside led_cdev->trigger_lock
*/
-static DEFINE_RWLOCK(triggers_list_lock);
+static DECLARE_RWSEM(triggers_list_lock);
static LIST_HEAD(trigger_list);
ssize_t led_trigger_store(struct device *dev, struct device_attribute *attr,
@@ -44,24 +45,24 @@ ssize_t led_trigger_store(struct device *dev, struct device_attribute *attr,
trigger_name[len - 1] = '\0';
if (!strcmp(trigger_name, "none")) {
- write_lock(&led_cdev->trigger_lock);
+ down_write(&led_cdev->trigger_lock);
led_trigger_set(led_cdev, NULL);
- write_unlock(&led_cdev->trigger_lock);
+ up_write(&led_cdev->trigger_lock);
return count;
}
- read_lock(&triggers_list_lock);
+ down_read(&triggers_list_lock);
list_for_each_entry(trig, &trigger_list, next_trig) {
if (!strcmp(trigger_name, trig->name)) {
- write_lock(&led_cdev->trigger_lock);
+ down_write(&led_cdev->trigger_lock);
led_trigger_set(led_cdev, trig);
- write_unlock(&led_cdev->trigger_lock);
+ up_write(&led_cdev->trigger_lock);
- read_unlock(&triggers_list_lock);
+ up_read(&triggers_list_lock);
return count;
}
}
- read_unlock(&triggers_list_lock);
+ up_read(&triggers_list_lock);
return -EINVAL;
}
@@ -74,8 +75,8 @@ ssize_t led_trigger_show(struct device *dev, struct device_attribute *attr,
struct led_trigger *trig;
int len = 0;
- read_lock(&triggers_list_lock);
- read_lock(&led_cdev->trigger_lock);
+ down_read(&triggers_list_lock);
+ down_read(&led_cdev->trigger_lock);
if (!led_cdev->trigger)
len += sprintf(buf+len, "[none] ");
@@ -89,8 +90,8 @@ ssize_t led_trigger_show(struct device *dev, struct device_attribute *attr,
else
len += sprintf(buf+len, "%s ", trig->name);
}
- read_unlock(&led_cdev->trigger_lock);
- read_unlock(&triggers_list_lock);
+ up_read(&led_cdev->trigger_lock);
+ up_read(&triggers_list_lock);
len += sprintf(len+buf, "\n");
return len;
@@ -145,14 +146,14 @@ void led_trigger_set_default(struct led_classdev *led_cdev)
if (!led_cdev->default_trigger)
return;
- read_lock(&triggers_list_lock);
- write_lock(&led_cdev->trigger_lock);
+ down_read(&triggers_list_lock);
+ down_write(&led_cdev->trigger_lock);
list_for_each_entry(trig, &trigger_list, next_trig) {
if (!strcmp(led_cdev->default_trigger, trig->name))
led_trigger_set(led_cdev, trig);
}
- write_unlock(&led_cdev->trigger_lock);
- read_unlock(&triggers_list_lock);
+ up_write(&led_cdev->trigger_lock);
+ up_read(&triggers_list_lock);
}
int led_trigger_register(struct led_trigger *trigger)
@@ -163,18 +164,18 @@ int led_trigger_register(struct led_trigger *trigger)
INIT_LIST_HEAD(&trigger->led_cdevs);
/* Add to the list of led triggers */
- write_lock(&triggers_list_lock);
+ down_write(&triggers_list_lock);
list_add_tail(&trigger->next_trig, &trigger_list);
- write_unlock(&triggers_list_lock);
+ up_write(&triggers_list_lock);
/* Register with any LEDs that have this as a default trigger */
read_lock(&leds_list_lock);
list_for_each_entry(led_cdev, &leds_list, node) {
- write_lock(&led_cdev->trigger_lock);
+ down_write(&led_cdev->trigger_lock);
if (!led_cdev->trigger && led_cdev->default_trigger &&
!strcmp(led_cdev->default_trigger, trigger->name))
led_trigger_set(led_cdev, trigger);
- write_unlock(&led_cdev->trigger_lock);
+ up_write(&led_cdev->trigger_lock);
}
read_unlock(&leds_list_lock);
@@ -206,17 +207,17 @@ void led_trigger_unregister(struct led_trigger *trigger)
struct led_classdev *led_cdev;
/* Remove from the list of led triggers */
- write_lock(&triggers_list_lock);
+ down_write(&triggers_list_lock);
list_del(&trigger->next_trig);
- write_unlock(&triggers_list_lock);
+ up_write(&triggers_list_lock);
/* Remove anyone actively using this trigger */
read_lock(&leds_list_lock);
list_for_each_entry(led_cdev, &leds_list, node) {
- write_lock(&led_cdev->trigger_lock);
+ down_write(&led_cdev->trigger_lock);
if (led_cdev->trigger == trigger)
led_trigger_set(led_cdev, NULL);
- write_unlock(&led_cdev->trigger_lock);
+ up_write(&led_cdev->trigger_lock);
}
read_unlock(&leds_list_lock);
}
diff --git a/include/linux/leds.h b/include/linux/leds.h
index dc1178f6184..b4130ff58d0 100644
--- a/include/linux/leds.h
+++ b/include/linux/leds.h
@@ -14,6 +14,7 @@
#include <linux/list.h>
#include <linux/spinlock.h>
+#include <linux/rwsem.h>
struct device;
/*
@@ -43,7 +44,7 @@ struct led_classdev {
#ifdef CONFIG_LEDS_TRIGGERS
/* Protects the trigger data below */
- rwlock_t trigger_lock;
+ struct rw_semaphore trigger_lock;
struct led_trigger *trigger;
struct list_head trig_list;