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

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Message-ID: <20200821073147.GA1681156@kroah.com>
Date:   Fri, 21 Aug 2020 09:31:47 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     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 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>
> ---
>  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?

thanks,

greg k-h