virtio: S/390 set name of virtio devices directly.

Chris has a patch 'Fix silly output for virtio devices in /proc/interrupts'
which requires callers to the virtio driver infrastructure to set the bus_ids
themselves.  This does that for s/390.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Carsten Otte <cotte@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Chris Lalancette <clalance@redhat.com>
---
 drivers/s390/kvm/kvm_virtio.c |    2 ++
 1 file changed, 2 insertions(+)

diff -r c903ef6b391f drivers/s390/kvm/kvm_virtio.c
--- a/drivers/s390/kvm/kvm_virtio.c	Thu May 22 22:31:31 2008 +1000
+++ b/drivers/s390/kvm/kvm_virtio.c	Thu May 22 22:32:55 2008 +1000
@@ -265,6 +265,8 @@ static void add_kvm_device(struct kvm_de
 
 	kdev->vdev.dev.parent = &kvm_root;
 	kdev->vdev.index = dev_index++;
+	snprintf(kdev->vdev.dev.bus_id, BUS_ID_SIZE, "virtio%d",
+		 kdev->vdev.index);
 	kdev->vdev.id.device = d->type;
 	kdev->vdev.config = &kvm_vq_configspace_ops;
 	kdev->desc = d;