Class: add support for class interfaces for devices

When moving class_device usage over to device, we need to handle
class_interfaces properly with devices.  This patch adds that support.


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

1 files changed, 13 insertions, 1 deletions

diff --git a/drivers/base/core.c b/drivers/base/core.c
index e21a65fc043..1d3d3582fcc 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -372,6 +372,7 @@ int device_add(struct device *dev)
 {
         struct device *parent = NULL;
         char *class_name = NULL;
+        struct class_interface *class_intf;
         int error = -EINVAL;
 
         dev = get_device(dev);
@@ -451,9 +452,14 @@ int device_add(struct device *dev)
                 klist_add_tail(&dev->knode_parent, &parent->klist_children);
 
         if (dev->class) {
-                /* tie the class to the device */
                 down(&dev->class->sem);
+                /* tie the class to the device */
                 list_add_tail(&dev->node, &dev->class->devices);
+
+                /* notify any interfaces that the device is here */
+                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);
         }
 
@@ -548,6 +554,7 @@ void device_del(struct device * dev)
 {
         struct device * parent = dev->parent;
         char *class_name = NULL;
+        struct class_interface *class_intf;
 
         if (parent)
                 klist_del(&dev->knode_parent);
@@ -563,6 +570,11 @@ void device_del(struct device * dev)
                 }
                 kfree(class_name);
                 down(&dev->class->sem);
+                /* 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);
         }