From: Peter Hurley <peter@hurleysoftware.com>
Date: Sat, 15 Jun 2013 11:28:28 +0000 (-0400)
Subject: n_tty: Encapsulate minimum_to_wake within N_TTY
X-Git-Tag: omap-for-v3.11/fixes-for-merge-window~77^2~8
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f6c8dbe6e50c6e5121d7b6644718207daa008221;p=pandora-kernel.git

n_tty: Encapsulate minimum_to_wake within N_TTY

minimum_to_wake is unique to N_TTY processing, and belongs in
per-ldisc data.

Add the ldisc method, ldisc_ops::fasync(), to notify line disciplines
when signal-driven I/O is enabled or disabled. When enabled for N_TTY
(by fcntl(F_SETFL, O_ASYNC)), blocking reader/polls will be woken
for any readable input. When disabled, blocking reader/polls are not
woken until the read buffer is full.

Canonical mode (L_ICANON(tty), n_tty_data::icanon) is not affected by
the minimum_to_wake setting.

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