[Qemu-devel] [PATCH 14/14] uhci: Don't queue up packets after one with the SPD flag set

[Gerd Hoffmann <kraxel@redhat.com>]

From: Hans de Goede <hdegoede@redhat.com>

Don't queue up packets after a packet with the SPD (short packet detect)
flag set. Since we won't know if the packet will actually be short until it
has completed, and if it is short we should stop the queue.

This fixes a miniature photoframe emulating a USB cdrom with the windows
software for it not working.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 hw/usb/hcd-uhci.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/hw/usb/hcd-uhci.c b/hw/usb/hcd-uhci.c
index c7c8786..cdc8bc3 100644
--- a/hw/usb/hcd-uhci.c
+++ b/hw/usb/hcd-uhci.c
@@ -1000,6 +1000,9 @@ static void uhci_fill_queue(UHCIState *s, UHCI_TD *td)
         }
         assert(ret == TD_RESULT_ASYNC_START);
         assert(int_mask == 0);
+        if (ptd.ctrl & TD_CTRL_SPD) {
+            break;
+        }
         plink = ptd.link;
     }
 }
@@ -1097,7 +1100,7 @@ static void uhci_process_frame(UHCIState *s)
 
         case TD_RESULT_ASYNC_START:
             trace_usb_uhci_td_async(curr_qh & ~0xf, link & ~0xf);
-            if (is_valid(td.link)) {
+            if (is_valid(td.link) && !(td.ctrl & TD_CTRL_SPD)) {
                 uhci_fill_queue(s, &td);
             }
             link = curr_qh ? qh.link : td.link;
-- 
1.7.1