linux-kernel - Re: [PATCH] usb: cdnsp: Fix incorrect status for control request

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Date:   Mon, 13 Dec 2021 21:31:06 +0800
From:   Peter Chen <peter.chen@...nel.org>
To:     Pawel Laszczak <pawell@...ence.com>
Cc:     "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "jianhe@...arella.com" <jianhe@...arella.com>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: Re: [PATCH] usb: cdnsp: Fix incorrect status for control request

On 21-12-13 13:17:53, Pawel Laszczak wrote:
> >
> >On 21-12-09 12:57:31, Pawel Laszczak wrote:
> >> >> From: Pawel Laszczak <pawell@...ence.com>
> >> >>
> >> >> Patch fixes incorrect status for control request.
> >> >> Without this fix all usb_request objects were returned to upper drivers
> >> >> with usb_reqest->status field set to -EINPROGRESS.
> >> >>
> >> >> Fixes: 3d82904559f4 ("usb: cdnsp: cdns3 Add main part of Cadence USBSSP DRD Driver")
> >> >> Reported-by: Ken (Jian) He <jianhe@...arella.com>
> >> >> cc: <stable@...r.kernel.org>
> >> >> Signed-off-by: Pawel Laszczak <pawell@...ence.com>
> >> >> ---
> >> >>  drivers/usb/cdns3/cdnsp-ring.c | 2 ++
> >> >>  1 file changed, 2 insertions(+)
> >> >>
> >> >> diff --git a/drivers/usb/cdns3/cdnsp-ring.c b/drivers/usb/cdns3/cdnsp-ring.c
> >> >> index 1b1438457fb0..e8f5ecbb5c75 100644
> >> >> --- a/drivers/usb/cdns3/cdnsp-ring.c
> >> >> +++ b/drivers/usb/cdns3/cdnsp-ring.c
> >> >> @@ -1029,6 +1029,8 @@ static void cdnsp_process_ctrl_td(struct cdnsp_device *pdev,
> >> >>  		return;
> >> >>  	}
> >> >>
> >> >> +	*status = 0;
> >> >> +
> >> >>  	cdnsp_finish_td(pdev, td, event, pep, status);
> >> >>  }
> >> >>
> >> >> --
> >> >I think you may move *status = 0 at the beginning of
> >> >cdnsp_process_ctrl_td in case you would like to handle some error
> >> >conditions during this function.
> >>
> >> I don't predict any other status code for control request in this place.
> >> I wanted to set this status only once after completion status stage. It was the reason why I put this
> >> statement at the end of function.
> >
> >So, you always consider there is no error for control request handling?
> 
> Not exactly. In this place driver handles only case when status stage has been completed, 
> so control transfer has been finished successfully.   
> 
> Driver still take into account for  control transfer such errors as:  STALL, EINVAL and ECONNRESET but
> in other parts of source code.
> 

Reviewed-by: Peter Chen <peter.chen@...nel.org>

-- 

Thanks,
Peter Chen