virtio: console: Send SIGIO in case of port unplug

If a port has registered for SIGIO signals, let the application
know that the port is getting unplugged.

Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c
index 6d5c579b1693..dc42d5689483 100644
--- a/drivers/char/virtio_console.c
+++ b/drivers/char/virtio_console.c
@@ -1259,6 +1259,9 @@ static void unplug_port(struct port *port)
                 port->guest_connected = false;
                 port->host_connected = false;
                 wake_up_interruptible(&port->waitqueue);
+
+                /* Let the app know the port is going down. */
+                send_sigio_to_port(port);
         }
 
         if (is_console_port(port)) {