usb: add USB_RET_IOERROR

We already have USB_RET_NAK, but that means that a device does not want
to send/receive right now. But with host / network redirection we can
actually have a transaction fail due to some io error, rather then ie
the device just not having any data atm.

This patch adds a new error code named USB_RET_IOERROR for this, and uses
it were appropriate.

Notes:
-Currently all usb-controllers handle this the same as NODEV, but that
 may change in the future, OHCI could indicate a CRC error instead for example.
-This patch does not touch hw/usb-musb.c, that is because the code in there
 handles STALL and NAK specially and has a if status < 0 generic catch all
 for all other errors

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

1 files changed, 6 insertions, 5 deletions

diff --git a/hw/usb.h b/hw/usb.h
index 8e83697fb7..1a30ebb8f1 100644
--- a/hw/usb.h
+++ b/hw/usb.h
@@ -39,11 +39,12 @@
 #define USB_TOKEN_IN    0x69 /* device -> host */
 #define USB_TOKEN_OUT   0xe1 /* host -> device */
 
-#define USB_RET_NODEV  (-1)
-#define USB_RET_NAK    (-2)
-#define USB_RET_STALL  (-3)
-#define USB_RET_BABBLE (-4)
-#define USB_RET_ASYNC  (-5)
+#define USB_RET_NODEV   (-1)
+#define USB_RET_NAK     (-2)
+#define USB_RET_STALL   (-3)
+#define USB_RET_BABBLE  (-4)
+#define USB_RET_IOERROR (-5)
+#define USB_RET_ASYNC   (-6)
 
 #define USB_SPEED_LOW   0
 #define USB_SPEED_FULL  1