The virtio-serial ports are like pipes, if there's no reader on the other end, sending data might get it either ignored or the host might return '0', which would make guests get -EAGAIN. Since we know the state of the host port connection, it's appropriate to let the application know that the other end isn't connected. Signed-off-by: Amit Shah <amit.shah@xxxxxxxxxx> --- drivers/char/virtio_console.c | 3 +++ 1 files changed, 3 insertions(+), 0 deletions(-) diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c index 55de0b5..4562964 100644 --- a/drivers/char/virtio_console.c +++ b/drivers/char/virtio_console.c @@ -411,6 +411,9 @@ static ssize_t send_buf(struct port *port, void *in_buf, size_t in_count) ssize_t ret; unsigned int len; + if (use_multiport(port->portdev) && !port->host_connected) + return -EPIPE; + out_vq = port->out_vq; sg_init_one(sg, in_buf, in_count); -- 1.6.2.5 _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/virtualization
