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

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Date:   Thu, 15 Apr 2021 19:28:50 +0000
From:   Thinh Nguyen <Thinh.Nguyen@...opsys.com>
To:     Wesley Cheng <wcheng@...eaurora.org>,
        Felipe Balbi <balbi@...nel.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
CC:     "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "jackp@...eaurora.org" <jackp@...eaurora.org>
Subject: Re: [PATCH] usb: dwc3: gadget: Avoid canceling current request for
 queuing error

Thinh Nguyen wrote:
> Wesley Cheng wrote:
>>
>>
>> On 4/14/2021 11:26 PM, Felipe Balbi wrote:
>>> 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.
>>>
>> Hi Felipe,
>>
>> Thanks for the input/review, will make this change to just clear the HWO.
>>
> 
> Make sure to increment the dequeue pointer also. I think you can use
> dwc3_gadget_ep_skip_trbs().
> 

Nevermind. There maybe a problem with using dwc3_gadget_ep_skip_trbs().

Thinh