From: Peter Hurley <peter@hurleysoftware.com>
Date: Sat, 15 Jun 2013 14:04:23 +0000 (-0400)
Subject: n_tty: Replace echo_cnt with computed value
X-Git-Tag: v3.12-rc1~182^2~179
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=862eeffef1b465a12412f4ae6e5987ae292c968d;p=pandora-kernel.git

n_tty: Replace echo_cnt with computed value

Prepare for lockless echo_buf handling; compute current byte count
of echo_buf from head and tail indices.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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