[Qemu-devel] [PATCH 1/8] virtio-console: Also throttle when less was written then requested

[Hans de Goede <hdegoede@redhat.com>]

This is necessary so that we get properly woken up to write the rest.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Amit Shah <amit.shah@redhat.com>
---
 hw/virtio-console.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/hw/virtio-console.c b/hw/virtio-console.c
index e2d1c58..1d87c5b 100644
--- a/hw/virtio-console.c
+++ b/hw/virtio-console.c
@@ -47,7 +47,7 @@ static ssize_t flush_buf(VirtIOSerialPort *port, const uint8_t *buf, size_t len)
     ret = qemu_chr_fe_write(vcon->chr, buf, len);
     trace_virtio_console_flush_buf(port->id, len, ret);
 
-    if (ret <= 0) {
+    if (ret < len) {
         VirtIOSerialPortClass *k = VIRTIO_SERIAL_PORT_GET_CLASS(port);
 
         /*
@@ -56,7 +56,8 @@ static ssize_t flush_buf(VirtIOSerialPort *port, const uint8_t *buf, size_t len)
          * we had a finer-grained message, like -EPIPE, we could close
          * this connection.
          */
-        ret = 0;
+        if (ret < 0)
+            ret = 0;
         if (!k->is_console) {
             virtio_serial_throttle_port(port, true);
             qemu_chr_fe_add_watch(vcon->chr, G_IO_OUT, chr_write_unblocked,
-- 
1.8.1.4