[PATCH] hw/usb/hcd-ohci: Set transfer error code with no dev

[Ryan Wendland]

When a usb device is disconnected the transfer service functions bails
before appropraite transfer error flags are set.
This patch sets the appropriate condition code OHCI_CC_DEVICENOTRESPONDING
when a device is disconnected and consequently has no response on the USB bus.

Fixes: https://gitlab.com/qemu-project/qemu/-/issues/2081

Signed-off-by: Ryan Wendland <wendland@live.com.au>
---
 hw/usb/hcd-ohci.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/hw/usb/hcd-ohci.c b/hw/usb/hcd-ohci.c
index acd6016980..8cd25d74af 100644
--- a/hw/usb/hcd-ohci.c
+++ b/hw/usb/hcd-ohci.c
@@ -980,7 +980,8 @@ static int ohci_service_td(OHCIState *ohci, struct ohci_ed 
*ed)
         dev = ohci_find_device(ohci, OHCI_BM(ed->flags, ED_FA));
         if (dev == NULL) {
             trace_usb_ohci_td_dev_error();
-            return 1;
+            OHCI_SET_BM(td.flags, TD_CC, OHCI_CC_DEVICENOTRESPONDING);
+            goto exit_and_retire;
         }
         ep = usb_ep_get(dev, pid, OHCI_BM(ed->flags, ED_EN));
         if (ohci->async_td) {
@@ -1087,6 +1088,7 @@ static int ohci_service_td(OHCIState *ohci, struct 
ohci_ed *ed)
         ed->head |= OHCI_ED_H;
     }
 
+exit_and_retire:
     /* Retire this TD */
     ed->head &= ~OHCI_DPTR_MASK;
     ed->head |= td.next & OHCI_DPTR_MASK;
-- 
2.34.1