linux-kernel - Re: [PATCH] usb: dwc3: gadget: Avoid canceling current request for queuing error

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Message-ID: <87mtu0njvj.fsf@kernel.org>
Date:   Thu, 15 Apr 2021 09:26:40 +0300
From:   Felipe Balbi <balbi@...nel.org>
To:     Wesley Cheng <wcheng@...eaurora.org>, gregkh@...uxfoundation.org
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        jackp@...eaurora.org, Wesley Cheng <wcheng@...eaurora.org>
Subject: Re: [PATCH] usb: dwc3: gadget: Avoid canceling current request for
 queuing error

Wesley Cheng <wcheng@...eaurora.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@...eaurora.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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