Linux Virtualization - Mar 2019 - [PATCH] virtio_console: initialize vtermno value for ports

For regular serial ports we do not initialize value of vtermno 
variable. A garbage value is assigned for non console ports.
The value can be observed as a random integer with [1]. 

[1] vim /sys/kernel/debug/virtio-ports/vport*p*

This patch initialize the value of vtermno for console serial 
ports to '1' and regular serial ports are initiaized to '0'.

Reported-by: siliu at redhat.com
Signed-off-by: Pankaj Gupta <pagupta at redhat.com>
---
 drivers/char/virtio_console.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c
index fbeb71953526..05dbfdb9f4af 100644
--- a/drivers/char/virtio_console.c
+++ b/drivers/char/virtio_console.c
@@ -75,7 +75,7 @@ struct ports_driver_data {
 	/* All the console devices handled by this driver */
 	struct list_head consoles;
 };
-static struct ports_driver_data pdrvdata;
+static struct ports_driver_data pdrvdata = { .next_vtermno = 1};
 
 static DEFINE_SPINLOCK(pdrvdata_lock);
 static DECLARE_COMPLETION(early_console_added);
@@ -1394,6 +1394,7 @@ static int add_port(struct ports_device *portdev, u32 id)
 	port->async_queue = NULL;
 
 	port->cons.ws.ws_row = port->cons.ws.ws_col = 0;
+	port->cons.vtermno = 0;
 
 	port->host_connected = port->guest_connected = false;
 	port->stats = (struct port_stats) { 0 };
-- 
2.20.1