From: Peter Hurley <peter@hurleysoftware.com>
Date: Sat, 15 Jun 2013 13:36:07 +0000 (-0400)
Subject: tty: Simplify flip buffer list with 0-sized sentinel
X-Git-Tag: v3.12-rc1~182^2~191
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7391ee16950e772076d321792d9fbf030f921345;p=pandora-kernel.git

tty: Simplify flip buffer list with 0-sized sentinel

Use a 0-sized sentinel to avoid assigning the head ptr from
the driver side thread. This also eliminates testing head/tail
for NULL.

When the sentinel is first 'consumed' by the buffer work
(or by tty_buffer_flush()), it is detached from the list but not
freed nor added to the free list. Both buffer work and
tty_buffer_flush() continue to preserve at least 1 flip buffer
to which head & tail is pointed.

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