From: Rob Herring <rob.herring@calxeda.com>
Date: Wed, 25 Sep 2013 02:05:58 +0000 (-0500)
Subject: TTY: hvc_dcc: probe for a JTAG connection before registering
X-Git-Tag: omap-for-v3.13/fixes-for-merge-window-take2~63^2~80
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f377775dc083506e2fd7739d8615971c46b5246e;p=pandora-kernel.git

TTY: hvc_dcc: probe for a JTAG connection before registering

Enabling the ARM DCC console and using without a JTAG connection will
simply hang the system. Since distros like to turn on all options, this
is a reoccurring problem to debug. We can do better by checking if
anything is attached and handling characters. There is no way to probe
this, so send a newline and check that it is handled.

Cc: Paolo Pisati <paolo.pisati@canonical.com>
Cc: Tim Gardner <tim.gardner@canonical.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Rob Herring <rob.herring@calxeda.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

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