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usb: core: Kconfig: Improve USB authorization mode help

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Update the default USB device authorization mode help text so that the
meaning of the option and it's available values are described more
accurately.

Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Closes: https://lore.kernel.org/linux-usb/CAMuHMdUy793gzDVR0jfNnx5TUdJ_2MKH5NPGSgHkytAhArtqmw@mail.gmail.com/
Signed-off-by: Niko Mauno <niko.mauno@vaisala.com>
Link: https://lore.kernel.org/r/20240213124518.20231-1-niko.mauno@vaisala.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Niko Mauno 2024-02-13 14:45:18 +02:00 committed by Greg Kroah-Hartman
parent a9c83252bf
commit d4718efff7
1 changed files with 16 additions and 6 deletions
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22
drivers/usb/core/Kconfig
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@ -126,10 +126,20 @@ config USB_DEFAULT_AUTHORIZATION_MODE
Select the default USB device authorization mode. Can be overridden
with usbcore.authorized_default command line or module parameter.
The available values have the following meanings:
0 is unauthorized for all devices
1 is authorized for all devices (default)
2 is authorized for internal devices
This option allows you to choose whether USB devices that are
connected to the system can be used by default, or if they are
locked down.
If the default value is too permissive but you are unsure which mode
to use, say 2.
With value 0 all connected USB devices with the exception of root
hub require user space authorization before they can be used.
With value 1 (default) no user space authorization is required to
use connected USB devices.
With value 2 all connected USB devices with exception of internal
USB devices require user space authorization before they can be
used. Note that in this mode the differentiation between internal
and external USB devices relies on ACPI, and on systems without
ACPI selecting value 2 is analogous to selecting value 0.
If unsure, keep the default value.