linux-kernel - [PATCH v3 1/2] usb: gadget: legacy gadgets are optional

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Date:   Fri, 10 Mar 2017 14:11:41 +0100
From:   Romain Izard <romain.izard.pro@...il.com>
To:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Romain Izard <romain.izard.pro@...il.com>,
        "# 4 . 9+" <stable@...r.kernel.org>
Subject: [PATCH v3 1/2] 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@...r.kernel.org> # 4.9+
Signed-off-by: Romain Izard <romain.izard.pro@...il.com>
---
Changes in v2:
 - Reword description
Changes in v3:
 - Remove comment changes

 drivers/usb/gadget/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/usb/gadget/Kconfig b/drivers/usb/gadget/Kconfig
index 8ad203296079..f3ee80ece682 100644
--- 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
-- 
2.9.3