linux-kernel - Re: [PATCH] xhci: Always restore EP_SOFT_CLEAR

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Message-ID: <c6275105-a204-fe23-2dae-2bfa6c06a839@linux.intel.com>
Date:   Fri, 21 Aug 2020 11:44:34 +0300
From:   Mathias Nyman <mathias.nyman@...ux.intel.com>
To:     Greg KH <gregkh@...uxfoundation.org>,
        Ding Hui <dinghui@...gfor.com.cn>
Cc:     mathias.nyman@...el.com, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] xhci: Always restore EP_SOFT_CLEAR_TOGGLE even if ep
 reset failed

On 21.8.2020 10.31, Greg KH wrote:
> On Fri, Aug 21, 2020 at 03:06:52PM +0800, Ding Hui wrote:
>> Some devices driver call libusb_clear_halt when target ep queue
>> is not empty. (eg. spice client connected to qemu for usb redir)
>>
>> Before commit f5249461b504 ("xhci: Clear the host side toggle
>> manually when endpoint is soft reset"), that works well.
>> But now, we got the error log:
>>
>>     EP not empty, refuse reset
>>
>> xhch_endpoint_reset failed and left ep_state's EP_SOFT_CLEAR_TOGGLE
>> bit is still on
>>
>> So all the subsequent urb sumbit to the ep will fail with the
>> warn log:
>>
>>     Can't enqueue URB while manually clearing toggle
>>
>> We need restore ep_state EP_SOFT_CLEAR_TOGGLE bit after
>> xhci_endpoint_reset, even if it is failed.
>>
>> Signed-off-by: Ding Hui <dinghui@...gfor.com.cn>

Thanks, nice catch.

>> ---
>>  drivers/usb/host/xhci.c | 3 ++-
>>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> Shouldn't this have a Fixes: tag on it and be backported to the affected
> stable trees?

It should, but I like this patch and want it in, so I'll add the tags this time.

Thanks
-Mathias