virtio_console: Let unconnected rproc device receive data.

Allow rproc serial ports to receive data before the port
is connected.

Rproc serial ports usually talk to very simple remote devices
with no control queue managing open/close events. So we must
let remote devices write to the virtio ring even if the device
is not yet fully initialized.

Signed-off-by: Sjur Brændeland <sjur.brandeland@stericsson.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c
index 684b0d53764f38d218b8cff41d5a9e0c3e248979..95cae778bd73d1998521094dcfea4dca793b8ea8 100644 (file)
--- a/drivers/char/virtio_console.c
+++ b/drivers/char/virtio_console.c
@@ -1763,8 +1763,11 @@ static void in_intr(struct virtqueue *vq)
         * tty is spawned) and the host sends out data to console
         * ports.  For generic serial ports, the host won't
         * (shouldn't) send data till the guest is connected.
+        * However a remote device might send data before the port is
+        * connected. So don't remove data from a rproc_serial device.
         */
-       if (!port->guest_connected)
+
+       if (!port->guest_connected && !is_rproc_serial(port->portdev->vdev))
                discard_port_data(port);
 
        spin_unlock_irqrestore(&port->inbuf_lock, flags);