From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: Wed, 14 Mar 2012 07:37:04 +0000 (+1100)
Subject: powerpc/hvc_udbg: Don't crash when udbg_putc is NULL
X-Git-Tag: v3.4-rc1~159^2~15
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7d3d897a4697e4ff746e5e82f116b2346ed28150;p=pandora-kernel.git

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>
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