virtio: console: Accept console size along with resize control message

The VIRTIO_CONSOLE_RESIZE control message sent to us by the host now
contains the new {rows, cols} values for the console. This ensures each
console port gets its own size, and we don't depend on the config-space
rows and cols values at all now.

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>

diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c
index f1fe11a..458d907 100644 (file)
--- a/drivers/char/virtio_console.c
+++ b/drivers/char/virtio_console.c
@@ -1194,12 +1194,23 @@ static void handle_control_message(struct ports_device *portdev,
                 * have to notify the host first.
                 */
                break;
-       case VIRTIO_CONSOLE_RESIZE:
+       case VIRTIO_CONSOLE_RESIZE: {
+               struct {
+                       __u16 rows;
+                       __u16 cols;
+               } size;
+
                if (!is_console_port(port))
                        break;
+
+               memcpy(&size, buf->buf + buf->offset + sizeof(*cpkt),
+                      sizeof(size));
+               set_console_size(port, size.rows, size.cols);
+
                port->cons.hvc->irq_requested = 1;
                resize_console(port);
                break;
+       }
        case VIRTIO_CONSOLE_PORT_OPEN:
                port->host_connected = cpkt->value;
                wake_up_interruptible(&port->waitqueue);