From: Peter Hurley <peter@hurleysoftware.com>
Date: Tue, 30 Dec 2014 15:39:25 +0000 (-0500)
Subject: tty: Prevent hw state corruption in exclusive mode reopen
X-Git-Tag: fixes-v4.0-rc1~284^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=86f2c00f1d8e344965cf8df8572ed5f682956995;p=pandora-kernel.git

tty: Prevent hw state corruption in exclusive mode reopen

Exclusive mode ttys (TTY_EXCLUSIVE) do not allow further reopens;
fail the condition before associating the file pointer and calling
the driver open() method.

Prevents DTR programming when the tty is already in exclusive mode.

Reported-by: Shreyas Bethur <shreyas.bethur@ni.com>
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Acked-by: Shreyas Bethur <shreyas.bethur@ni.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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