USB: usbfs: deprecate and hide option for !embedded

Modern systems do not use usbfs; the entries within it are files,
not device nodes, and do not support ACLs which are the default way to
provide access to USB devices to untrusted users.

It is replaced by device-nodes maintained by udev in /dev/bus/usb,
libusb uses this device nodes.

Mark the option as deprecated, and hide entirely for non-embedded builds
(which may not be using udev but require raw USB device access).

Signed-off-by: Scott James Remnant <scott@canonical.com>
Acked-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/core/Kconfig b/drivers/usb/core/Kconfig
index e1759d17ac5d17ca9cafeea4d67094954af07462..69280c35b5cbc6d93cc50c99d7f4a7f747c1fc99 100644 (file)
--- a/drivers/usb/core/Kconfig
+++ b/drivers/usb/core/Kconfig
@@ -28,7 +28,7 @@ comment "Miscellaneous USB options"
        depends on USB
 
 config USB_DEVICEFS
-       bool "USB device filesystem"
+       bool "USB device filesystem (DEPRECATED)" if EMBEDDED
        depends on USB
        ---help---
          If you say Y here (and to "/proc file system support" in the "File
@@ -46,11 +46,15 @@ config USB_DEVICEFS
          For the format of the various /proc/bus/usb/ files, please read
          <file:Documentation/usb/proc_usb_info.txt>.
 
-         Usbfs files can't handle Access Control Lists (ACL), which are the
-         default way to grant access to USB devices for untrusted users of a
-         desktop system. The usbfs functionality is replaced by real
-         device-nodes managed by udev. These nodes live in /dev/bus/usb and
-         are used by libusb.
+         Modern Linux systems do not use this.
+
+         Usbfs entries are files and not character devices; usbfs can't
+         handle Access Control Lists (ACL) which are the default way to
+         grant access to USB devices for untrusted users of a desktop
+         system.
+
+         The usbfs functionality is replaced by real device-nodes managed by
+         udev.  These nodes lived in /dev/bus/usb and are used by libusb.
 
 config USB_DEVICE_CLASS
        bool "USB device class-devices (DEPRECATED)"