virtio: console: We support only one device at a time

We support only one virtio_console device at a time. If multiple are
found, error out if one is already initialized.

Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c
index 791be4e91d15..bfc0abf825ed 100644
--- a/drivers/char/virtio_console.c
+++ b/drivers/char/virtio_console.c
@@ -204,6 +204,11 @@ static int __devinit virtcons_probe(struct virtio_device *dev)
         struct virtqueue *vqs[2];
         int err;
 
+        if (vdev) {
+                dev_warn(&vdev->dev,
+                         "Multiple virtio-console devices not supported yet\n");
+                return -EEXIST;
+        }
         vdev = dev;
 
         /* This is the scratch page we use to receive console input */