[PATCH 7/7] driver-core : convert semaphore to mutex in structclass

From: Dave Young
Date: Sat Jan 12 2008 - 05:02:18 EST

Convert the class semaphore to mutex.

Signed-off-by: Dave Young <hidave.darkstar@xxxxxxxxx>

---
drivers/base/class.c | 38 +++++++++++++++++++-------------------
drivers/base/core.c | 18 ++++++++----------
include/linux/device.h | 3 ++-
3 files changed, 29 insertions(+), 30 deletions(-)

diff -upr linux/drivers/base/class.c linux.new/drivers/base/class.c
--- linux/drivers/base/class.c 2008-01-12 16:11:07.000000000 +0800
+++ linux.new/drivers/base/class.c 2008-01-12 16:11:08.000000000 +0800
@@ -144,7 +144,7 @@ int class_register(struct class * cls)
INIT_LIST_HEAD(&cls->devices);
INIT_LIST_HEAD(&cls->interfaces);
kset_init(&cls->class_dirs);
- init_MUTEX(&cls->sem);
+ mutex_init(&cls->mutex);
error = kobject_set_name(&cls->subsys.kobj, "%s", cls->name);
if (error)
return error;
@@ -617,13 +617,13 @@ int class_device_add(struct class_device
kobject_uevent(&class_dev->kobj, KOBJ_ADD);

/* notify any interfaces this device is now here */
- down(&parent_class->sem);
+ mutex_lock_nested(&parent_class->mutex, SINGLE_DEPTH_NESTING);
list_add_tail(&class_dev->node, &parent_class->children);
list_for_each_entry(class_intf, &parent_class->interfaces, node) {
if (class_intf->add)
class_intf->add(class_dev, class_intf);
}
- up(&parent_class->sem);
+ mutex_unlock(&parent_class->mutex);

goto out1;

@@ -725,12 +725,12 @@ void class_device_del(struct class_devic
struct class_interface *class_intf;

if (parent_class) {
- down(&parent_class->sem);
+ mutex_lock(&parent_class->mutex);
list_del_init(&class_dev->node);
list_for_each_entry(class_intf, &parent_class->interfaces, node)
if (class_intf->remove)
class_intf->remove(class_dev, class_intf);
- up(&parent_class->sem);
+ mutex_unlock(&parent_class->mutex);
}

if (class_dev->dev) {
@@ -772,14 +772,14 @@ void class_device_destroy(struct class *
struct class_device *class_dev = NULL;
struct class_device *class_dev_tmp;

- down(&cls->sem);
+ mutex_lock(&cls->mutex);
list_for_each_entry(class_dev_tmp, &cls->children, node) {
if (class_dev_tmp->devt == devt) {
class_dev = class_dev_tmp;
break;
}
}
- up(&cls->sem);
+ mutex_unlock(&cls->mutex);

if (class_dev)
class_device_unregister(class_dev);
@@ -818,7 +818,7 @@ int class_for_each_device(struct class *

if (!class)
return -EINVAL;
- down(&class->sem);
+ mutex_lock(&class->mutex);
list_for_each_entry(dev, &class->devices, node) {
dev = get_device(dev);
if (dev) {
@@ -829,7 +829,7 @@ int class_for_each_device(struct class *
if (error)
break;
}
- up(&class->sem);
+ mutex_unlock(&class->mutex);

return error;
}
@@ -858,7 +858,7 @@ struct device *class_find_device(struct
if (!class)
return NULL;

- down(&class->sem);
+ mutex_lock(&class->mutex);
list_for_each_entry(dev, &class->devices, node) {
dev = get_device(dev);
if (dev) {
@@ -870,7 +870,7 @@ struct device *class_find_device(struct
} else
break;
}
- up(&class->sem);
+ mutex_unlock(&class->mutex);

if (error)
return NULL;
@@ -898,7 +898,7 @@ int class_for_each_child(struct class *c

if (!class)
return -EINVAL;
- down(&class->sem);
+ mutex_lock(&class->mutex);
list_for_each_entry(dev, &class->children, node) {
dev = class_device_get(dev);
if (dev) {
@@ -909,7 +909,7 @@ int class_for_each_child(struct class *c
if (error)
break;
}
- up(&class->sem);
+ mutex_unlock(&class->mutex);

return error;
}
@@ -938,7 +938,7 @@ struct class_device *class_find_child(st
if (!class)
return NULL;

- down(&class->sem);
+ mutex_lock(&class->mutex);
list_for_each_entry(dev, &class->children, node) {
dev = class_device_get(dev);
if (dev) {
@@ -950,7 +950,7 @@ struct class_device *class_find_child(st
} else
break;
}
- up(&class->sem);
+ mutex_unlock(&class->mutex);

if (error)
return NULL;
@@ -971,7 +971,7 @@ int class_interface_register(struct clas
if (!parent)
return -EINVAL;

- down(&parent->sem);
+ mutex_lock(&parent->mutex);
list_add_tail(&class_intf->node, &parent->interfaces);
if (class_intf->add) {
list_for_each_entry(class_dev, &parent->children, node)
@@ -981,7 +981,7 @@ int class_interface_register(struct clas
list_for_each_entry(dev, &parent->devices, node)
class_intf->add_dev(dev, class_intf);
}
- up(&parent->sem);
+ mutex_unlock(&parent->mutex);

return 0;
}
@@ -995,7 +995,7 @@ void class_interface_unregister(struct c
if (!parent)
return;

- down(&parent->sem);
+ mutex_lock(&parent->mutex);
list_del_init(&class_intf->node);
if (class_intf->remove) {
list_for_each_entry(class_dev, &parent->children, node)
@@ -1005,7 +1005,7 @@ void class_interface_unregister(struct c
list_for_each_entry(dev, &parent->devices, node)
class_intf->remove_dev(dev, class_intf);
}
- up(&parent->sem);
+ mutex_unlock(&parent->mutex);

class_put(parent);
}
diff -upr linux/drivers/base/core.c linux.new/drivers/base/core.c
--- linux/drivers/base/core.c 2008-01-12 16:11:07.000000000 +0800
+++ linux.new/drivers/base/core.c 2008-01-12 16:11:08.000000000 +0800
@@ -19,8 +19,6 @@
#include <linux/kdev_t.h>
#include <linux/notifier.h>

-#include <asm/semaphore.h>
-
#include "base.h"
#include "power/power.h"

@@ -783,7 +781,7 @@ int device_add(struct device *dev)
klist_add_tail(&dev->knode_parent, &parent->klist_children);

if (dev->class) {
- down(&dev->class->sem);
+ mutex_lock(&dev->class->mutex);
/* tie the class to the device */
list_add_tail(&dev->node, &dev->class->devices);

@@ -791,7 +789,7 @@ int device_add(struct device *dev)
list_for_each_entry(class_intf, &dev->class->interfaces, node)
if (class_intf->add_dev)
class_intf->add_dev(dev, class_intf);
- up(&dev->class->sem);
+ mutex_unlock(&dev->class->mutex);
}
Done:
put_device(dev);
@@ -928,14 +926,14 @@ void device_del(struct device * dev)
sysfs_remove_link(&dev->kobj, "device");
}

- down(&dev->class->sem);
+ mutex_lock(&dev->class->mutex);
/* notify any interfaces that the device is now gone */
list_for_each_entry(class_intf, &dev->class->interfaces, node)
if (class_intf->remove_dev)
class_intf->remove_dev(dev, class_intf);
/* remove the device from the class list */
list_del_init(&dev->node);
- up(&dev->class->sem);
+ mutex_unlock(&dev->class->mutex);

/* If we live in a parent class-directory, unreference it */
if (dev->kobj.parent->kset == &dev->class->class_dirs) {
@@ -946,7 +944,7 @@ void device_del(struct device * dev)
* if we are the last child of our class, delete
* our class-directory at this parent
*/
- down(&dev->class->sem);
+ mutex_lock(&dev->class->mutex);
list_for_each_entry(d, &dev->class->devices, node) {
if (d == dev)
continue;
@@ -959,7 +957,7 @@ void device_del(struct device * dev)
kobject_del(dev->kobj.parent);

kobject_put(dev->kobj.parent);
- up(&dev->class->sem);
+ mutex_unlock(&dev->class->mutex);
}
}
device_remove_file(dev, &uevent_attr);
@@ -1168,14 +1166,14 @@ void device_destroy(struct class *class,
struct device *dev = NULL;
struct device *dev_tmp;

- down(&class->sem);
+ mutex_lock(&class->mutex);
list_for_each_entry(dev_tmp, &class->devices, node) {
if (dev_tmp->devt == devt) {
dev = dev_tmp;
break;
}
}
- up(&class->sem);
+ mutex_unlock(&class->mutex);

if (dev)
device_unregister(dev);
diff -upr linux/include/linux/device.h linux.new/include/linux/device.h
--- linux/include/linux/device.h 2008-01-12 16:11:07.000000000 +0800
+++ linux.new/include/linux/device.h 2008-01-12 16:11:08.000000000 +0800
@@ -20,6 +20,7 @@
#include <linux/types.h>
#include <linux/module.h>
#include <linux/pm.h>
+#include <linux/mutex.h>
#include <asm/semaphore.h>
#include <asm/atomic.h>
#include <asm/device.h>
@@ -180,7 +181,7 @@ struct class {
struct list_head devices;
struct list_head interfaces;
struct kset class_dirs;
- struct semaphore sem; /* locks both the children and interfaces lists */
+ struct mutex mutex;

struct class_attribute * class_attrs;
struct class_device_attribute * class_dev_attrs;
--
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