linux-kernel - Re: [PATCH v5 1/2] driver core: Move the "removable" attribute from USB to core

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Date:   Thu, 27 May 2021 09:40:40 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Rajat Jain <rajatja@...gle.com>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Alan Stern <stern@...land.harvard.edu>,
        linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-usb@...r.kernel.org, helgaas@...nel.org,
        Oliver Neukum <oneukum@...e.com>,
        David Laight <David.Laight@...lab.com>,
        Krzysztof Wilczyński <kw@...ux.com>,
        rajatxjain@...il.com, jsbarnes@...gle.com, dtor@...gle.com
Subject: Re: [PATCH v5 1/2] driver core: Move the "removable" attribute from
 USB to core

On Mon, May 24, 2021 at 10:18:11AM -0700, Rajat Jain wrote:
> Move the "removable" attribute from USB to core in order to allow it to be
> supported by other subsystem / buses. Individual buses that want to support
> this attribute can populate the removable property of the device while
> enumerating it with the 3 possible values -
>  - "unknown"
>  - "fixed"
>  - "removable"
> Leaving the field unchanged (i.e. "not supported") would mean that the
> attribute would not show up in sysfs for that device. The UAPI (location,
> symantics etc) for the attribute remains unchanged.
> 
> Move the "removable" attribute from USB to the device core so it can be
> used by other subsystems / buses.
> 
> By default, devices do not have a "removable" attribute in sysfs.
> 
> If a subsystem or bus driver wants to support a "removable" attribute, it
> should call device_set_removable() before calling device_register() or
> device_add(), e.g.:
> 
>     device_set_removable(dev, DEVICE_REMOVABLE);
>     device_register(dev);
> 
> The possible values and the resulting sysfs attribute contents are:
> 
>     DEVICE_REMOVABLE_UNKNOWN  ->  "unknown"
>     DEVICE_REMOVABLE          ->  "removable"
>     DEVICE_FIXED              ->  "fixed"
> 
> Convert the USB "removable" attribute to use this new device core
> functionality.  There should be no user-visible change in the location or
> semantics of attribute for USB devices.
> 
> Signed-off-by: Rajat Jain <rajatja@...gle.com>
> Reviewed-by: Bjorn Helgaas <bhelgaas@...gle.com>
> ---
> v5: - Update commit log per Bjorn's suggestion, and add "Reviewed by".
>     - don't check for dev!=NULL    

I've applied this series to my USB tree now, thanks for reworking it so
many times.

greg k-h