9p: send uevent after adding/removing mount_tag attribute

This driver adds an attribute to the existing virtio device so a CHANGE
event is required in order udev rules to make use of it. The ADD event
happens before this driver is probed and unlike a more typical driver
like a block device there isn't a higher level device to watch for.

Signed-off-by: Michael Marineau <michael.marineau@coreos.com>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/net/9p/trans_virtio.c b/net/9p/trans_virtio.c
index e1c26b101830..990afab2be1b 100644
--- a/net/9p/trans_virtio.c
+++ b/net/9p/trans_virtio.c
@@ -577,6 +577,10 @@ static int p9_virtio_probe(struct virtio_device *vdev)
         mutex_lock(&virtio_9p_lock);
         list_add_tail(&chan->chan_list, &virtio_chan_list);
         mutex_unlock(&virtio_9p_lock);
+
+        /* Let udev rules use the new mount_tag attribute. */
+        kobject_uevent(&(vdev->dev.kobj), KOBJ_CHANGE);
+
         return 0;
 
 out_free_tag:
@@ -654,6 +658,7 @@ static void p9_virtio_remove(struct virtio_device *vdev)
         list_del(&chan->chan_list);
         mutex_unlock(&virtio_9p_lock);
         sysfs_remove_file(&(vdev->dev.kobj), &dev_attr_mount_tag.attr);
+        kobject_uevent(&(vdev->dev.kobj), KOBJ_CHANGE);
         kfree(chan->tag);
         kfree(chan->vc_wq);
         kfree(chan);