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authorRichard Purdie <rpurdie@rpsys.net>2007-12-31 23:09:44 +0000
committerRichard Purdie <rpurdie@rpsys.net>2007-12-31 23:09:44 +0000
commit72f8da329e07ad8a72c1f0e96b8955cfeb7c7329 (patch)
tree7440f70caf2fb70e987f814cebcdf233a17b425c
parente697789d64f8748cb219d7f5c413c512953802cc (diff)
leds: Fix leds_list_lock locking issues
Covert leds_list_lock to a rw_sempahore to match previous LED trigger locking fixes, fixing lock ordering. Signed-off-by: Richard Purdie <rpurdie@rpsys.net>
-rw-r--r--drivers/leds/led-class.c8
-rw-r--r--drivers/leds/led-core.c4
-rw-r--r--drivers/leds/led-triggers.c8
-rw-r--r--drivers/leds/leds.h3
4 files changed, 12 insertions, 11 deletions
diff --git a/drivers/leds/led-class.c b/drivers/leds/led-class.c
index ba8b04b03b9..64c66b3769c 100644
--- a/drivers/leds/led-class.c
+++ b/drivers/leds/led-class.c
@@ -106,9 +106,9 @@ int led_classdev_register(struct device *parent, struct led_classdev *led_cdev)
goto err_out;
/* add to the list of leds */
- write_lock(&leds_list_lock);
+ down_write(&leds_list_lock);
list_add_tail(&led_cdev->node, &leds_list);
- write_unlock(&leds_list_lock);
+ up_write(&leds_list_lock);
#ifdef CONFIG_LEDS_TRIGGERS
init_rwsem(&led_cdev->trigger_lock);
@@ -155,9 +155,9 @@ void led_classdev_unregister(struct led_classdev *led_cdev)
device_unregister(led_cdev->dev);
- write_lock(&leds_list_lock);
+ down_write(&leds_list_lock);
list_del(&led_cdev->node);
- write_unlock(&leds_list_lock);
+ up_write(&leds_list_lock);
}
EXPORT_SYMBOL_GPL(led_classdev_unregister);
diff --git a/drivers/leds/led-core.c b/drivers/leds/led-core.c
index 9b015f9af35..5d1ca10524b 100644
--- a/drivers/leds/led-core.c
+++ b/drivers/leds/led-core.c
@@ -14,11 +14,11 @@
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/module.h>
-#include <linux/spinlock.h>
+#include <linux/rwsem.h>
#include <linux/leds.h>
#include "leds.h"
-DEFINE_RWLOCK(leds_list_lock);
+DECLARE_RWSEM(leds_list_lock);
LIST_HEAD(leds_list);
EXPORT_SYMBOL_GPL(leds_list);
diff --git a/drivers/leds/led-triggers.c b/drivers/leds/led-triggers.c
index 0bdb786210b..13c9026d68a 100644
--- a/drivers/leds/led-triggers.c
+++ b/drivers/leds/led-triggers.c
@@ -169,7 +169,7 @@ int led_trigger_register(struct led_trigger *trigger)
up_write(&triggers_list_lock);
/* Register with any LEDs that have this as a default trigger */
- read_lock(&leds_list_lock);
+ down_read(&leds_list_lock);
list_for_each_entry(led_cdev, &leds_list, node) {
down_write(&led_cdev->trigger_lock);
if (!led_cdev->trigger && led_cdev->default_trigger &&
@@ -177,7 +177,7 @@ int led_trigger_register(struct led_trigger *trigger)
led_trigger_set(led_cdev, trigger);
up_write(&led_cdev->trigger_lock);
}
- read_unlock(&leds_list_lock);
+ up_read(&leds_list_lock);
return 0;
}
@@ -212,14 +212,14 @@ void led_trigger_unregister(struct led_trigger *trigger)
up_write(&triggers_list_lock);
/* Remove anyone actively using this trigger */
- read_lock(&leds_list_lock);
+ down_read(&leds_list_lock);
list_for_each_entry(led_cdev, &leds_list, node) {
down_write(&led_cdev->trigger_lock);
if (led_cdev->trigger == trigger)
led_trigger_set(led_cdev, NULL);
up_write(&led_cdev->trigger_lock);
}
- read_unlock(&leds_list_lock);
+ up_read(&leds_list_lock);
}
void led_trigger_unregister_simple(struct led_trigger *trigger)
diff --git a/drivers/leds/leds.h b/drivers/leds/leds.h
index f2f3884fe06..12b6fe93b13 100644
--- a/drivers/leds/leds.h
+++ b/drivers/leds/leds.h
@@ -14,6 +14,7 @@
#define __LEDS_H_INCLUDED
#include <linux/device.h>
+#include <linux/rwsem.h>
#include <linux/leds.h>
static inline void led_set_brightness(struct led_classdev *led_cdev,
@@ -26,7 +27,7 @@ static inline void led_set_brightness(struct led_classdev *led_cdev,
led_cdev->brightness_set(led_cdev, value);
}
-extern rwlock_t leds_list_lock;
+extern struct rw_semaphore leds_list_lock;
extern struct list_head leds_list;
#ifdef CONFIG_LEDS_TRIGGERS