usb: gadget: legacy gadgets are optional

With commit bc49d1d17dcf ("usb: gadget: don't couple configfs to legacy
gadgets"),it is possible to build a modular kernel with both built-in
configfs support and modular legacy gadget drivers.

But when building a kernel without modules, it is also necessary to be
able to build with configfs but without any legacy gadget driver. This
was a possible configuration when the USB_CONFIGFS was a part of the
choice options, but not anymore.

Mark the choice for legacy gadget drivers as optional restores this.

Fixes: bc49d1d17dcf ("usb: gadget: don't couple configfs to legacy gadgets")
Cc: <stable@vger.kernel.org> # 4.9+
Signed-off-by: Romain Izard <romain.izard.pro@gmail.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

diff --git a/drivers/usb/gadget/Kconfig b/drivers/usb/gadget/Kconfig
index 8ad203296079f6a9cf5e7457db1017784725a710..f3ee80ece68284551caab11e57ab664a61d0d784 100644 (file)
--- a/drivers/usb/gadget/Kconfig
+++ b/drivers/usb/gadget/Kconfig
@@ -460,6 +460,7 @@ config USB_CONFIGFS_F_TCM
 choice
        tristate "USB Gadget Drivers"
        default USB_ETH
+       optional
        help
          A Linux "Gadget Driver" talks to the USB Peripheral Controller
          driver through the abstract "gadget" API.  Some other operating