virtio: console: Make read() return -ENODEV on hot-unplug
When a port is hot-unplugged while an app was blocked on a read() call,
the call was unblocked but would not get an error returned.
Return -ENODEV to ensure the app knows the port has gone away.
Signed-off-by: Amit Shah <amit.shah@redhat.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 47b710c..e17ecf5 100644
--- a/drivers/char/virtio_console.c
+++ b/drivers/char/virtio_console.c
@@ -582,6 +582,9 @@
if (ret < 0)
return ret;
}
+ /* Port got hot-unplugged. */
+ if (!port->guest_connected)
+ return -ENODEV;
/*
* We could've received a disconnection message while we were
* waiting for more data.