[SLOF] [PATCH 2/3] virtio-serial: Make read and write methods report failure

[Jordan Niethe]

From: Kautuk Consul <kconsul at linux.vnet.ibm.com>

The read and write methods return as though they were successfully even
if the virtio device is closed (virtiodev is 0) and it is not able to
send or receive any characters.

Make the read and write methods return 0 to indicate they did not
succeed in this case.

Signed-off-by: Kautuk Consul <kconsul at linux.vnet.ibm.com>
Signed-off-by: Jordan Niethe <jniethe5 at gmail.com>
---
 board-qemu/slof/virtio-serial.fs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/board-qemu/slof/virtio-serial.fs b/board-qemu/slof/virtio-serial.fs
index a67a310..41e2e04 100644
--- a/board-qemu/slof/virtio-serial.fs
+++ b/board-qemu/slof/virtio-serial.fs
@@ -67,7 +67,7 @@ virtiodev virtio-serial-init drop
 ;
 
 : write ( addr len -- actual )
-    virtiodev 0= IF nip EXIT THEN
+    virtiodev 0= IF 2drop 0 EXIT THEN
     tuck
     0 ?DO
         dup c@ virtiodev SWAP virtio-serial-putchar
@@ -78,7 +78,7 @@ virtiodev virtio-serial-init drop
 
 : read ( addr len -- actual )
     0= IF drop 0 EXIT THEN
-    virtiodev 0= IF drop 1 EXIT THEN
+    virtiodev 0= IF drop 0 EXIT THEN
     virtiodev virtio-serial-haschar 0= IF 0 swap c! -2 EXIT THEN
     virtiodev virtio-serial-getchar swap c! 1
 ;
-- 
2.39.3