USB_DWCOTG: Disable building dwc_otg as a module (#2265)

When dwc_otg is built as a module, build will fail with the following
error:

ERROR: "DWC_TASK_HI_SCHEDULE" [drivers/usb/host/dwc_otg/dwc_otg.ko] undefined!
scripts/Makefile.modpost:91: recipe for target '__modpost' failed
make[1]: *** [__modpost] Error 1
Makefile:1199: recipe for target 'modules' failed
make: *** [modules] Error 2

Even if the error is solved by including the missing
DWC_TASK_HI_SCHEDULE function, the kernel will panic when loading
dwc_otg.

As a workaround, simply prevent user from building dwc_otg as a module
as the current kernel does not support it.

See: https://github.com/raspberrypi/linux/issues/2258

Signed-off-by: Malik Olivier Boussejra <malik@boussejra.com>

diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
index f3cecb64a380c6d7fca6116c2f94ca42eb3c1aba..fa39573658a2883ff60bf6297592941764d78485 100644 (file)
--- a/drivers/usb/host/Kconfig
+++ b/drivers/usb/host/Kconfig
@@ -763,7 +763,7 @@ config USB_HWA_HCD
          will be called "hwa-hc".
 
 config USB_DWCOTG
-       tristate "Synopsis DWC host support"
+       bool "Synopsis DWC host support"
        depends on USB && (FIQ || ARM64)
        help
          The Synopsis DWC controller is a dual-role
@@ -772,9 +772,6 @@ config USB_DWCOTG
          Enable this option to support this IP in host controller mode.
          If unsure, say N.
 
-         To compile this driver as a module, choose M here: the
-         modules built will be called dwc_otg and dwc_common_port.
-
 config USB_IMX21_HCD
        tristate "i.MX21 HCD support"
        depends on ARM && ARCH_MXC