X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=drivers%2Fbase%2Fsys.c;h=358bb0be3c0838b9233bae7b1eab1cc2b05ef1e6;hb=2fff58fce14701e27d5e8a50fa73caef9a6907f5;hp=2f79c55acdcc6af406a9e03b469a4853eefee808;hpb=75659ca0c10992dcb39258518368a0f6f56e935d;p=linux-2.6

diff --git a/drivers/base/sys.c b/drivers/base/sys.c
index 2f79c55acd..358bb0be3c 100644
--- a/drivers/base/sys.c
+++ b/drivers/base/sys.c
@@ -133,6 +133,7 @@ int sysdev_class_register(struct sysdev_class * cls)
 	pr_debug("Registering sysdev class '%s'\n",
 		 kobject_name(&cls->kset.kobj));
 	INIT_LIST_HEAD(&cls->drivers);
+	memset(&cls->kset.kobj, 0x00, sizeof(struct kobject));
 	cls->kset.kobj.parent = &system_kset->kobj;
 	cls->kset.kobj.ktype = &ktype_sysdev_class;
 	cls->kset.kobj.kset = system_kset;
@@ -166,6 +167,21 @@ int sysdev_driver_register(struct sysdev_class *cls, struct sysdev_driver *drv)
 {
 	int err = 0;
 
+	if (!cls) {
+		printk(KERN_WARNING "sysdev: invalid class passed to "
+			"sysdev_driver_register!\n");
+		WARN_ON(1);
+		return -EINVAL;
+	}
+
+	/* Check whether this driver has already been added to a class. */
+	if (drv->entry.next && !list_empty(&drv->entry)) {
+		printk(KERN_WARNING "sysdev: class %s: driver (%p) has already"
+			" been registered to a class, something is wrong, but "
+			"will forge on!\n", cls->name, drv);
+		WARN_ON(1);
+	}
+
 	mutex_lock(&sysdev_drivers_lock);
 	if (cls && kset_get(&cls->kset)) {
 		list_add_tail(&drv->entry, &cls->drivers);
@@ -178,7 +194,7 @@ int sysdev_driver_register(struct sysdev_class *cls, struct sysdev_driver *drv)
 		}
 	} else {
 		err = -EINVAL;
-		printk(KERN_ERR "%s: invalid device class\n", __FUNCTION__);
+		printk(KERN_ERR "%s: invalid device class\n", __func__);
 		WARN_ON(1);
 	}
 	mutex_unlock(&sysdev_drivers_lock);
@@ -227,6 +243,9 @@ int sysdev_register(struct sys_device * sysdev)
 
 	pr_debug("Registering sys device '%s'\n", kobject_name(&sysdev->kobj));
 
+	/* initialize the kobject to 0, in case it had previously been used */
+	memset(&sysdev->kobj, 0x00, sizeof(struct kobject));
+
 	/* Make sure the kset is set */
 	sysdev->kobj.kset = &cls->kset;