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

From: Dan Williams <dan.j.williams@intel.com>
To: "Kuppuswamy,
	Sathyanarayanan"  <sathyanarayanan.kuppuswamy@linux.intel.com>
Cc: Alan Stern <stern@rowland.harvard.edu>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Borislav Petkov <bp@alien8.de>, X86 ML <x86@kernel.org>,
	Bjorn Helgaas <bhelgaas@google.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>,
	Andreas Noever <andreas.noever@gmail.com>,
	"Michael S . Tsirkin" <mst@redhat.com>,
	Michael Jamet <michael.jamet@intel.com>,
	Yehezkel Bernat <YehezkelShB@gmail.com>,
	"Rafael J . Wysocki" <rafael@kernel.org>,
	Mika Westerberg <mika.westerberg@linux.intel.com>,
	Jonathan Corbet <corbet@lwn.net>,
	Jason Wang <jasowang@redhat.com>, Andi Kleen <ak@linux.intel.com>,
	Kuppuswamy Sathyanarayanan <knsathya@kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Linux PCI <linux-pci@vger.kernel.org>,
	USB list <linux-usb@vger.kernel.org>,
	virtualization@lists.linux-foundation.org
Subject: Re: [PATCH v2 1/6] driver core: Move the "authorized" attribute from USB/Thunderbolt to core
Date: Wed, 29 Sep 2021 21:59:25 -0700	[thread overview]
Message-ID: <CAPcyv4gDgQYf0ct_Xy32gQBcWhs6d2uL+wUq4pfzszDHcUHbwQ@mail.gmail.com> (raw)
In-Reply-To: <f9b7cf97-0a14-1c80-12ab-23213ec2f4f2@linux.intel.com>

On Wed, Sep 29, 2021 at 7:39 PM Kuppuswamy, Sathyanarayanan
<sathyanarayanan.kuppuswamy@linux.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.