[SCSI] raid class: handle component-add errors

Signed-off-by: Jeff Garzik <jeff@garzik.org>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

2 files changed, 19 insertions, 6 deletions

diff --git a/drivers/scsi/raid_class.c b/drivers/scsi/raid_class.c
index 327b33a57b0a..86e13183c9ba 100644
--- a/drivers/scsi/raid_class.c
+++ b/drivers/scsi/raid_class.c
@@ -215,18 +215,19 @@ static void raid_component_release(struct class_device *cdev)
         kfree(rc);
 }
 
-void raid_component_add(struct raid_template *r,struct device *raid_dev,
-                        struct device *component_dev)
+int raid_component_add(struct raid_template *r,struct device *raid_dev,
+                       struct device *component_dev)
 {
         struct class_device *cdev =
                 attribute_container_find_class_device(&r->raid_attrs.ac,
                                                       raid_dev);
         struct raid_component *rc;
         struct raid_data *rd = class_get_devdata(cdev);
+        int err;
 
         rc = kzalloc(sizeof(*rc), GFP_KERNEL);
         if (!rc)
-                return;
+                return -ENOMEM;
 
         INIT_LIST_HEAD(&rc->node);
         class_device_initialize(&rc->cdev);
@@ -239,7 +240,18 @@ void raid_component_add(struct raid_template *r,struct device *raid_dev,
         list_add_tail(&rc->node, &rd->component_list);
         rc->cdev.parent = cdev;
         rc->cdev.class = &raid_class.class;
-        class_device_add(&rc->cdev);
+        err = class_device_add(&rc->cdev);
+        if (err)
+                goto err_out;
+
+        return 0;
+
+err_out:
+        list_del(&rc->node);
+        rd->component_count--;
+        put_device(component_dev);
+        kfree(rc);
+        return err;
 }
 EXPORT_SYMBOL(raid_component_add);
 
diff --git a/include/linux/raid_class.h b/include/linux/raid_class.h
index d0dd38b3a2fd..d22ad392242a 100644
--- a/include/linux/raid_class.h
+++ b/include/linux/raid_class.h
@@ -77,5 +77,6 @@ DEFINE_RAID_ATTRIBUTE(enum raid_state, state)
 struct raid_template *raid_class_attach(struct raid_function_template *);
 void raid_class_release(struct raid_template *);
 
-void raid_component_add(struct raid_template *, struct device *,
-                        struct device *);
+int __must_check raid_component_add(struct raid_template *, struct device *,
+                                    struct device *);
+