[PATCH] Driver core: fix locking issues with the devices that are attached to classes

Doh, that was foolish...

Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/base/core.c b/drivers/base/core.c
index d0f84ff..27c2176 100644 (file)
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -356,6 +356,13 @@ int device_add(struct device *dev)
        if (parent)
                klist_add_tail(&dev->knode_parent, &parent->klist_children);
 
+       if (dev->class) {
+               /* tie the class to the device */
+               down(&dev->class->sem);
+               list_add_tail(&dev->node, &dev->class->devices);
+               up(&dev->class->sem);
+       }
+
        /* notify platform of device entry */
        if (platform_notify)
                platform_notify(dev);
@@ -455,6 +462,9 @@ void device_del(struct device * dev)
                sysfs_remove_link(&dev->kobj, "device");
                sysfs_remove_link(&dev->parent->kobj, class_name);
                kfree(class_name);
+               down(&dev->class->sem);
+               list_del_init(&dev->node);
+               up(&dev->class->sem);
        }
        device_remove_file(dev, &dev->uevent_attr);
 
@@ -601,11 +611,6 @@ struct device *device_create(struct class *class, struct device *parent,
        if (retval)
                goto error;
 
-       /* tie the class to the device */
-       down(&class->sem);
-       list_add_tail(&dev->node, &class->devices);
-       up(&class->sem);
-
        return dev;
 
 error:
@@ -636,9 +641,7 @@ void device_destroy(struct class *class, dev_t devt)
        }
        up(&class->sem);
 
-       if (dev) {
-               list_del_init(&dev->node);
+       if (dev)
                device_unregister(dev);
-       }
 }
 EXPORT_SYMBOL_GPL(device_destroy);