powerpc/hvc_udbg: Don't crash when udbg_putc is NULL
Also while at it, add some help text indicating why you shouldn't
enable that driver under normal circumstances
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
diff --git a/drivers/tty/hvc/Kconfig b/drivers/tty/hvc/Kconfig
index 8ea7f07..48cb8d3 100644
--- a/drivers/tty/hvc/Kconfig
+++ b/drivers/tty/hvc/Kconfig
@@ -71,6 +71,10 @@
depends on PPC && EXPERIMENTAL
select HVC_DRIVER
default n
+ help
+ This is meant to be used during HW bring up or debugging when
+ no other console mechanism exist but udbg, to get you a quick
+ console for userspace. Do NOT enable in production kernels.
config HVC_DCC
bool "ARM JTAG DCC console"