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SubjectRe: [PATCH] usb: dwc3: gadget: Avoid canceling current request for queuing error
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Wesley Cheng <wcheng@codeaurora.org> writes:

> If an error is received when issuing a start or update transfer
> command, the error handler will stop all active requests (including
> the current USB request), and call dwc3_gadget_giveback() to notify
> function drivers of the requests which have been stopped. Avoid
> having to cancel the current request which is trying to be queued, as
> the function driver will handle the EP queue error accordingly.
> Simply unmap the request as it was done before, and allow previously
> started transfers to be cleaned up.
>
> Signed-off-by: Wesley Cheng <wcheng@codeaurora.org>
> ---
> drivers/usb/dwc3/gadget.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
> index e1b04c97..4200775 100644
> --- a/drivers/usb/dwc3/gadget.c
> +++ b/drivers/usb/dwc3/gadget.c
> @@ -1399,6 +1399,11 @@ static int __dwc3_gadget_kick_transfer(struct dwc3_ep *dep)
> if (ret == -EAGAIN)
> return ret;
>
> + /* Avoid canceling current request, as it has not been started */
> + if (req->trb)
> + memset(req->trb, 0, sizeof(struct dwc3_trb));

we don't need a full memset. I think ensuring HWO bit is zero is enough.

--
balbi
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