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

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Date:   Thu, 9 Dec 2021 12:57:31 +0000
From:   Pawel Laszczak <pawell@...ence.com>
To:     Peter Chen <peter.chen@...nel.org>
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

>> 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.

--

Regards
Pawel Laszczak