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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@redhat.com
Signed-off-by: Pankaj Gupta <pagupta@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Pankaj Gupta 2019-03-19 11:34:06 +05:30 committed by Greg Kroah-Hartman
parent 67fbfc3943
commit 4b0a2c5ff7
1 changed files with 2 additions and 1 deletions
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3
drivers/char/virtio_console.c
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@ -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 };