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 21:59:25 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     "Kuppuswamy, Sathyanarayanan" 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
Cc:     Alan Stern <stern@...land.harvard.edu>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Borislav Petkov <bp@...en8.de>, X86 ML <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>,
        Andi Kleen <ak@...ux.intel.com>,
        Kuppuswamy Sathyanarayanan <knsathya@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux PCI <linux-pci@...r.kernel.org>,
        USB list <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 7:39 PM Kuppuswamy, Sathyanarayanan
<sathyanarayanan.kuppuswamy@...ux.intel.com> wrote:
>
>
>
> On 9/29/21 6:55 PM, Dan Williams wrote:
> >> Also, you ignored the usb_[de]authorize_interface() functions and
> >> their friends.
> > Ugh, yes.
>
> I did not change it because I am not sure about the interface vs device
> dependency.
>

This is was the rationale for has_probe_authorization flag. USB
performs authorization of child devices based on the authorization
state of the parent interface.

> I think following change should work.
>
> diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c
> index f57b5a7a90ca..84969732d09c 100644
> --- a/drivers/usb/core/driver.c
> +++ b/drivers/usb/core/driver.c
> @@ -334,7 +334,7 @@ static int usb_probe_interface(struct device *dev)
>         if (udev->dev.authorized == false) {
>                 dev_err(&intf->dev, "Device is not authorized for usage\n");
>                 return error;
> -       } else if (intf->authorized == 0) {
> +       } else if (intf->dev.authorized == 0) {

== false.

>                 dev_err(&intf->dev, "Interface %d is not authorized for usage\n",
>                                 intf->altsetting->desc.bInterfaceNumber);
>                 return error;
> @@ -546,7 +546,7 @@ int usb_driver_claim_interface(struct usb_driver *driver,
>                 return -EBUSY;
>
>         /* reject claim if interface is not authorized */
> -       if (!iface->authorized)
> +       if (!iface->dev.authorized)

I'd do == false to keep it consistent with other conversions.

>                 return -ENODEV;
>
>         dev->driver = &driver->drvwrap.driver;
> diff --git a/drivers/usb/core/message.c b/drivers/usb/core/message.c
> index 47548ce1cfb1..ab3c8d1e4db9 100644
> --- a/drivers/usb/core/message.c
> +++ b/drivers/usb/core/message.c
> @@ -1791,9 +1791,9 @@ void usb_deauthorize_interface(struct usb_interface *intf)
>
>         device_lock(dev->parent);
>
> -       if (intf->authorized) {
> +       if (intf->dev.authorized) {
>                 device_lock(dev);
> -               intf->authorized = 0;
> +               intf->dev.authorized = 0;

= false;

>                 device_unlock(dev);
>
>                 usb_forced_unbind_intf(intf);
> @@ -1811,9 +1811,9 @@ void usb_authorize_interface(struct usb_interface *intf)
>   {
>         struct device *dev = &intf->dev;
>
> -       if (!intf->authorized) {
> +       if (!intf->dev.authorized) {
>                 device_lock(dev);
> -               intf->authorized = 1; /* authorize interface */
> +               intf->dev.authorized = 1; /* authorize interface */

= true

...not sure that comment is worth preserving.