linux-kernel - Re: [PATCH 1/2] usb: hub: Mark root hubs on removable devices, as removable.

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Date:   Mon, 4 Oct 2021 14:56:08 -0700
From:   Rajat Jain <rajatja@...gle.com>
To:     Oliver Neukum <oneukum@...e.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alan Stern <stern@...land.harvard.edu>,
        Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        Mathias Nyman <mathias.nyman@...ux.intel.com>,
        Andrew Lunn <andrew@...n.ch>,
        Chris Chiu <chris.chiu@...onical.com>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        levinale@...gle.com, bleung@...gle.com, rajatxjain@...il.com,
        jsbarnes@...gle.com, pmalani@...gle.com,
        Dmitry Torokhov <dtor@...gle.com>
Subject: Re: [PATCH 1/2] usb: hub: Mark root hubs on removable devices, as removable.

+Dmitry Torokhov

On Thu, Sep 30, 2021 at 1:02 AM Oliver Neukum <oneukum@...e.com> wrote:
>
>
> On 30.09.21 00:48, Rajat Jain wrote:
> > Currently all usb root hubs are always marked as DEVICE_REMOVABLE_UNKNOWN
> > unconditionally. Let us try to help the users to identify the removable
> > root hubs, by checking the device on which the root hub sits. If the base
> > (parent) device on which the root hub sits, is removable (e.g. on
> > thunderbolt docks), then the roothub is also marked as removable.
> >
> > Signed-off-by: Rajat Jain <rajatja@...gle.com>
>
> Hi,
>
> frankly, why? You are needlessly throwing away information about where
> in the tree
> removal can happen.

I think this comment was meant for the *next* patch
(https://lkml.org/lkml/2021/9/29/1023) and perhaps we can discuss this
there? Let me copy your comment there and respond.

*This* patch does not throw away any information as currently the root
hubs are always and unconditionally marked as "unknown". This patch
aims to provide information where we can, for roothubs only.

Thanks,

Rajat


This looks like a worsening, not an improvement to me.
>
>     Regards
>         Oliver
>