From: Peter Hurley <peter@hurleysoftware.com>
Date: Sat, 15 Jun 2013 13:14:21 +0000 (-0400)
Subject: n_tty: Don't wrap input buffer indices at buffer size
X-Git-Tag: v3.12-rc1~182^2~213
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bc5a5e3f45d047844830233fb95b19a95c864a0f;p=pandora-kernel.git

n_tty: Don't wrap input buffer indices at buffer size

Wrap read_buf indices (read_head, read_tail, canon_head) at
max representable value, instead of at the N_TTY_BUF_SIZE. This step
is necessary to allow lockless reads of these shared variables
(by updating the variables atomically).

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