virtio: console: Un-block reads on chardev close

If a chardev is closed, any blocked read / poll calls should just return
and not attempt to use other state.

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 e1d382b155322b2bda662f70bb6bd990b6a736c4..92f1f65d57a923c338d117f036af30f0af054963 100644 (file)
--- a/drivers/char/virtio_console.c
+++ b/drivers/char/virtio_console.c
@@ -528,6 +528,10 @@ static ssize_t fill_readbuf(struct port *port, char *out_buf, size_t out_count,
 /* The condition that must be true for polling to end */
 static bool will_read_block(struct port *port)
 {
+       if (!port->guest_connected) {
+               /* Port got hot-unplugged. Let's exit. */
+               return false;
+       }
        return !port_has_data(port) && port->host_connected;
 }