Commit b3dddb9e authored Sep 02, 2010 by Amit Shah Committed by Rusty Russell Oct 21, 2010

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>

parent 8529a504

drivers/char/virtio_console.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -582,6 +582,9 @@ static ssize_t port_fops_read(struct file filp, char __user ubuf,
		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.