linux-kernel - RE: [PATCH] usb: cdnsp: Fixes issue with dequeuing not queued requests

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Message-ID: <BYAPR07MB5381BA3F7A34D18BC16B86DFDD34A@BYAPR07MB5381.namprd07.prod.outlook.com>
Date:   Fri, 14 Jul 2023 07:19:21 +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>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: RE: [PATCH] usb: cdnsp: Fixes issue with dequeuing not queued
 requests

>
>On 23-07-13 04:14:29, Pawel Laszczak wrote:
>> Gadget ACM while unloading module try to dequeue not queued usb
>> request which causes the kernel to crash.
>> Patch adds extra condition to check whether usb request is processed
>> by CDNSP driver.
>>
>
>Why ACM does that?
>
>> cc: <stable@...r.kernel.org>
>> Fixes: 3d82904559f4 ("usb: cdnsp: cdns3 Add main part of Cadence
>> USBSSP DRD Driver")
>> Signed-off-by: Pawel Laszczak <pawell@...ence.com>
>> ---
>>  drivers/usb/cdns3/cdnsp-gadget.c | 3 +++
>>  1 file changed, 3 insertions(+)
>>
>> diff --git a/drivers/usb/cdns3/cdnsp-gadget.c
>> b/drivers/usb/cdns3/cdnsp-gadget.c
>> index fff9ec9c391f..3a30c2af0c00 100644
>> --- a/drivers/usb/cdns3/cdnsp-gadget.c
>> +++ b/drivers/usb/cdns3/cdnsp-gadget.c
>> @@ -1125,6 +1125,9 @@ static int cdnsp_gadget_ep_dequeue(struct
>usb_ep *ep,
>>  	unsigned long flags;
>>  	int ret;
>>
>> +	if (request->status != -EINPROGRESS)
>> +		return 0;
>> +
>
>Why not you use pending list which used at cdnsp_ep_enqueue to do this?

It's just simpler and faster way - no other reasons. 

Thank,
Pawel

>
>
>>  	if (!pep->endpoint.desc) {
>>  		dev_err(pdev->dev,
>>  			"%s: can't dequeue to disabled endpoint\n",
>> --
>> 2.37.2
>>
>
>--
>
>Thanks,
>Peter Chen