linux-kernel - Re: [PATCH v2 1/6] driver core: Move the "authorized" attribute from USB/Thunderbolt to core

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Date:   Wed, 29 Sep 2021 21:42:29 -0400
From:   Alan Stern <stern@...land.harvard.edu>
To:     Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Borislav Petkov <bp@...en8.de>, x86@...nel.org,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Andreas Noever <andreas.noever@...il.com>,
        "Michael S . Tsirkin" <mst@...hat.com>,
        Michael Jamet <michael.jamet@...el.com>,
        Yehezkel Bernat <YehezkelShB@...il.com>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Jonathan Corbet <corbet@....net>,
        Jason Wang <jasowang@...hat.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Kuppuswamy Sathyanarayanan <knsathya@...nel.org>,
        linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-usb@...r.kernel.org,
        virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH v2 1/6] driver core: Move the "authorized" attribute from
 USB/Thunderbolt to core

On Wed, Sep 29, 2021 at 06:05:06PM -0700, Kuppuswamy Sathyanarayanan wrote:
> Currently bus drivers like "USB" or "Thunderbolt" implement a custom
> version of device authorization to selectively authorize the driver
> probes. Since there is a common requirement, move the "authorized"
> attribute support to the driver core in order to allow it to be used
> by other subsystems / buses.
> 
> Similar requirements have been discussed in the PCI [1] community for
> PCI bus drivers as well.
> 
> No functional changes are intended. It just converts authorized
> attribute from int to bool and moves it to the driver core. There
> should be no user-visible change in the location or semantics of
> attributes for USB devices.
> 
> Regarding thunderbolt driver, although it declares sw->authorized as
> "int" and allows 0,1,2 as valid values for sw->authorized attribute,
> but within the driver, in all authorized attribute related checks,
> it is treated as bool value. So when converting the authorized
> attribute from int to bool value, there should be no functional
> changes other than value 2 being not visible to the user.
> 
> [1]: https://lore.kernel.org/all/CACK8Z6E8pjVeC934oFgr=VB3pULx_GyT2NkzAogdRQJ9TKSX9A@mail.gmail.com/
> 
> Reviewed-by: Dan Williams <dan.j.williams@...el.com>
> Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>

Since you're moving the authorized flag from the USB core to the
driver core, the corresponding sysfs attribute functions should be
moved as well.

Also, you ignored the usb_[de]authorize_interface() functions and 
their friends.

Alan Stern