[PATCH v4] usb: xhci: fix lack of short packet event trb handling

[Marek Vasut]

On 11/18/20 8:49 AM, Ran Wang wrote:
> For bulk IN transfer, the codes will set ISP flag to request event TRB
> being generated by xHC for the case of short packet. So when encountering
> buffer-cross-64K-boundary (which we will divide payload and enqueuqe
> more than 1 transfer TRB), and the first TRB ends up with a short packet
> condition it will trigger an short packet code transfer event per that
> flag and cause more than 1 event TRB generated for this transfer.
> 
> However, current codes will only handle the first transfer event TRB
> then mark current transfer completed, causing next transfer
> failure due to event TRB mis-match.
> 
> Such issue has been observed on some Layerscape platforms (LS1028A,
> LS1088A, etc) with USB ethernet device.
> 
> This patch adds a loop to make sure the event TRB for last transfer TRB
> has been handled in time.

Applied, thanks.