net/9p/usbg: allow building as standalone module

There is no reason only the usbg transport would not be its own module,
so make it tristate.

In particular, this fixes a couple of issues the current bool had:
- trans_usbg was apparently not compiled at all when NET_9P=m
- the workaround added in commit 2193ede180dd ("net/9p/usbg: fix
CONFIG_USB_GADGET dependency") became redundant because a tristate item
cannot be built-in when its dependency is a module, so we can depend on
USB_GADGET "normally" again.

Cc: Michael Grzeschik <m.grzeschik@pengutronix.de>
Link: https://lkml.kernel.org/r/ZzhWRPDNwu225NWz@codewreck.org
Message-ID: <20241122144754.1231919-1-asmadeus@codewreck.org>
Signed-off-by: Dominique Martinet <asmadeus@codewreck.org>

diff --git a/net/9p/Kconfig b/net/9p/Kconfig
index ee967fd25312cbe3999044700d71a756cf21eb74..22f8c167845d11062e37ad6e608a4de7f5186af0 100644 (file)
--- a/net/9p/Kconfig
+++ b/net/9p/Kconfig
@@ -41,8 +41,8 @@ config NET_9P_XEN
          two Xen domains.
 
 config NET_9P_USBG
-       bool "9P USB Gadget Transport"
-       depends on USB_GADGET=y || USB_GADGET=NET_9P
+       tristate "9P USB Gadget Transport"
+       depends on USB_GADGET
        select CONFIGFS_FS
        select USB_LIBCOMPOSITE
        help