9p: send uevent after adding/removing mount_tag attribute

commit e0d6cb9cd3a3ac8a3b8e5b22b83c4f8619786f22 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/9p/trans_virtio.c b/net/9p/trans_virtio.c
index e1c26b1..990afab 100644 (file)
--- 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);