diff options
Diffstat (limited to 'hw/usb/hcd-xhci.c')
| -rw-r--r-- | hw/usb/hcd-xhci.c | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/hw/usb/hcd-xhci.c b/hw/usb/hcd-xhci.c index 776699b44e..828c2a7d78 100644 --- a/hw/usb/hcd-xhci.c +++ b/hw/usb/hcd-xhci.c @@ -1767,9 +1767,18 @@ static void xhci_xfer_report(XHCITransfer *xfer) break; } - if (!reported && ((trb->control & TRB_TR_IOC) || - (shortpkt && (trb->control & TRB_TR_ISP)) || - (xfer->status != CC_SUCCESS && left == 0))) { + /* + * XHCI 1.1, 4.11.3.1 Transfer Event TRB -- "each Transfer TRB + * encountered with its IOC flag set to '1' shall generate a Transfer + * Event." + * + * Otherwise, longer transfers can have multiple data TRBs (for scatter + * gather). Short transfers and errors should be reported once per + * transfer only. + */ + if ((trb->control & TRB_TR_IOC) || + (!reported && ((shortpkt && (trb->control & TRB_TR_ISP)) || + (xfer->status != CC_SUCCESS && left == 0)))) { event.slotid = xfer->slotid; event.epid = xfer->epid; event.length = (trb->status & 0x1ffff) - chunk; |