linux-kernel - Re: [PATCH] tools: usb: usbip: adding support for older kernel versions

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Message-ID: <44e151af-b6c4-d0af-3ef1-a5632d079915@kernel.org>
Date:   Sat, 16 Mar 2019 17:39:50 -0600
From:   shuah <shuah@...nel.org>
To:     David Valleau <valleau@...omium.org>,
        LKML <linux-kernel@...r.kernel.org>
Cc:     briannorris@...omium.org, linux-usb@...r.kernel.org,
        Michael Grzeschik <m.grzeschik@...gutronix.de>,
        Valentina Manea <valentina.manea.m@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sasha Levin <alexander.levin@...rosoft.com>,
        shuah <shuah@...nel.org>
Subject: Re: [PATCH] tools: usb: usbip: adding support for older kernel
 versions

Hi David,

On 3/6/19 2:47 PM, David Valleau wrote:
> The current usbip tool relies on the behavior of the vhci-hcd driver in
> order to work correctly. In instances where a newer version of the tool
> is used with an older version of the kernel, there are incompatibilities
> that can sometimes result in failure.

usbip tool is tied to the kernel version. This is reason why it is
co-located with the usbip driver in the kernel sources. This is not
a typical tool scenario to be able to use new tool on old kernels.

I would like to understand the reasons for wanting to run new tool on
old kernels.

thanks,
-- Shuah