From a461e11e7b8ca2705889bcf9582f6a8f84884bd2 Mon Sep 17 00:00:00 2001
From: Amit Shah <amit.shah@redhat.com>
Date: Thu, 2 Sep 2010 18:47:54 +0530
Subject: [PATCH] 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>
---
 drivers/char/virtio_console.c | 3 +++
 1 file changed, 3 insertions(+)

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)) {