virtio: console: Generate a kobject CHANGE event on adding 'name' attribute

When the host lets us know what 'name' a port is assigned, we create the
sysfs 'name' attribute. Generate a 'change' event after this so that
udev wakes up and acts on the rules for virtio-ports (currently there's
only one rule that creates a symlink from the 'name' to the actual char
device).

Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c
index f404ccf..67b474b 100644 (file)
--- a/drivers/char/virtio_console.c
+++ b/drivers/char/virtio_console.c
@@ -947,11 +947,18 @@ static void handle_control_message(struct ports_device *portdev,
                 */
                err = sysfs_create_group(&port->dev->kobj,
                                         &port_attribute_group);
-               if (err)
+               if (err) {
                        dev_err(port->dev,
                                "Error %d creating sysfs device attributes\n",
                                err);
-
+               } else {
+                       /*
+                        * Generate a udev event so that appropriate
+                        * symlinks can be created based on udev
+                        * rules.
+                        */
+                       kobject_uevent(&port->dev->kobj, KOBJ_CHANGE);
+               }
                break;
        case VIRTIO_CONSOLE_PORT_REMOVE:
                /*