linux-kernel - RE: [PATCH V2] USBIP: return correct port ENABLE status

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Date:   Wed, 10 Jan 2018 08:12:42 +0000
From:   "Zhang, Pei" <pei.zhang@...el.com>
To:     "shuah@...nel.org" <shuah@...nel.org>,
        "valentina.manea.m@...il.com" <valentina.manea.m@...il.com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
CC:     "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Shuah Khan <shuahkh@....samsung.com>
Subject: RE: [PATCH V2] USBIP: return correct port ENABLE status

Hi Shuah,

Thanks for your response. It's on KVM hypervisor platform, while the Dom0 is the usbip server, and a DomU act as the client. This issue could be 100% reproduced with the specified devices referred in my patch comment.

I will prepare the environment and then send you related information later. 

*********  ***** 
BRs, 
Pei Zhang

> -----Original Message-----
> From: Shuah Khan [mailto:shuah@...nel.org]
> Sent: Wednesday, January 10, 2018 1:44 AM
> To: Zhang, Pei <pei.zhang@...el.com>; valentina.manea.m@...il.com;
> gregkh@...uxfoundation.org
> Cc: linux-usb@...r.kernel.org; linux-kernel@...r.kernel.org; Shuah Khan
> <shuahkh@....samsung.com>; Shuah Khan <shuah@...nel.org>
> Subject: Re: [PATCH V2] USBIP: return correct port ENABLE status
> 
> On 12/18/2017 11:00 PM, pei.zhang@...el.com wrote:
> > From: Pei Zhang <pei.zhang@...el.com>
> >
> > USB system will clear port's ENABLE feature for some USB devices when
> > vdev is already assigned port address. This cause getPortStatus
> > reports to system that this device is not enabled, client OS will
> > failed to use this usb device.
> >
> > The failure devices include a SAMSUNG SSD storage, Logitech webcam
> C920.
> >
> > V2: send again to all related maintainers.
> >
> > Signed-off-by: Pei Zhang <pei.zhang@...el.com>
> 
> Hi Pei Zhang,
> 
> Can you elaborate on how you can trigger this condition? Can you send me
> more information on how to recreate the problem and demsg from server
> and client side when this problem happens.
> 
> thanks,
> -- Shuah