virtio-serial: Apps should consume all data that guest sends out / Fix virtio api abuse

We cannot indicate to the guest how much data was consumed by an app for
out_bufs.  So we just have to assume the apps will consume all the data
that are handed over to them.

Fix the virtio api abuse in control_out() and handle_output().

Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/hw/virtio-serial.h b/hw/virtio-serial.h
index f02387325f..62d76a25fe 100644
--- a/hw/virtio-serial.h
+++ b/hw/virtio-serial.h
@@ -136,10 +136,10 @@ struct VirtIOSerialPortInfo {
 
     /*
      * Guest wrote some data to the port. This data is handed over to
-     * the app via this callback. The app should return the number of
-     * bytes it successfully consumed.
+     * the app via this callback.  The app is supposed to consume all
+     * the data that is presented to it.
      */
-    size_t (*have_data)(VirtIOSerialPort *port, const uint8_t *buf, size_t len);
+    void (*have_data)(VirtIOSerialPort *port, const uint8_t *buf, size_t len);
 };
 
 /* Interface to the virtio-serial bus */