[S390] cio: ccw group fix unbind behaviour.

For a ccw group device unbinding it from its driver should do the
same as a call to ungroup, since this virtual device can not exist
without a driver.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 36 insertions, 6 deletions

diff --git a/drivers/s390/cio/ccwgroup.c b/drivers/s390/cio/ccwgroup.c
index 2becedbe8883..86b136cb09e0 100644
--- a/drivers/s390/cio/ccwgroup.c
+++ b/drivers/s390/cio/ccwgroup.c
@@ -314,16 +314,32 @@ error:
 }
 EXPORT_SYMBOL(ccwgroup_create_from_string);
 
-static int __init
-init_ccwgroup (void)
+static int ccwgroup_notifier(struct notifier_block *nb, unsigned long action,
+                             void *data);
+
+static struct notifier_block ccwgroup_nb = {
+        .notifier_call = ccwgroup_notifier
+};
+
+static int __init init_ccwgroup(void)
 {
-        return bus_register (&ccwgroup_bus_type);
+        int ret;
+
+        ret = bus_register(&ccwgroup_bus_type);
+        if (ret)
+                return ret;
+
+        ret = bus_register_notifier(&ccwgroup_bus_type, &ccwgroup_nb);
+        if (ret)
+                bus_unregister(&ccwgroup_bus_type);
+
+        return ret;
 }
 
-static void __exit
-cleanup_ccwgroup (void)
+static void __exit cleanup_ccwgroup(void)
 {
-        bus_unregister (&ccwgroup_bus_type);
+        bus_unregister_notifier(&ccwgroup_bus_type, &ccwgroup_nb);
+        bus_unregister(&ccwgroup_bus_type);
 }
 
 module_init(init_ccwgroup);
@@ -455,6 +471,7 @@ ccwgroup_remove (struct device *dev)
         struct ccwgroup_driver *gdrv;
 
         device_remove_file(dev, &dev_attr_online);
+        device_remove_file(dev, &dev_attr_ungroup);
 
         if (!dev->driver)
                 return 0;
@@ -492,6 +509,19 @@ static struct bus_type ccwgroup_bus_type = {
         .shutdown = ccwgroup_shutdown,
 };
 
+
+static int ccwgroup_notifier(struct notifier_block *nb, unsigned long action,
+                             void *data)
+{
+        struct device *dev = data;
+
+        if (action == BUS_NOTIFY_UNBIND_DRIVER)
+                device_schedule_callback(dev, ccwgroup_ungroup_callback);
+
+        return NOTIFY_OK;
+}
+
+
 /**
  * ccwgroup_driver_register() - register a ccw group driver
  * @cdriver: driver to be registered