virtio: console: Resize console port 0 on config intr only if multiport is off

When using multiport, we'll use control messages. Ensure we don't
accidentally update port 0 size on config interrupts.

Signed-off-by: Amit Shah <amit.shah@redhat.com>
CC: Christian Borntraeger <borntraeger@de.ibm.com>
CC: linuxppc-dev@ozlabs.org
CC: Kusanagi Kouichi <slash@ac.auone-net.jp>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

1 files changed, 10 insertions, 7 deletions

diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c
index 4175a2ae972f..1e3f4674da4a 100644
--- a/drivers/char/virtio_console.c
+++ b/drivers/char/virtio_console.c
@@ -1319,13 +1319,16 @@ static void config_intr(struct virtio_device *vdev)
 
         portdev = vdev->priv;
 
-        /*
-         * We'll use this way of resizing only for legacy support.
-         * For newer userspace (VIRTIO_CONSOLE_F_MULTPORT+), use
-         * control messages to indicate console size changes so that
-         * it can be done per-port
-         */
-        resize_console(find_port_by_id(portdev, 0));
+        if (!use_multiport(portdev)) {
+                /*
+                 * We'll use this way of resizing only for legacy
+                 * support.  For newer userspace
+                 * (VIRTIO_CONSOLE_F_MULTPORT+), use control messages
+                 * to indicate console size changes so that it can be
+                 * done per-port.
+                 */
+                resize_console(find_port_by_id(portdev, 0));
+        }
 }
 
 static int init_vqs(struct ports_device *portdev)