From: Peter Hurley <peter@hurleysoftware.com>
Date: Thu, 7 Nov 2013 19:01:57 +0000 (-0500)
Subject: n_tty: Protect minimum_to_wake reset for concurrent readers
X-Git-Tag: v3.13-rc2~15^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=aebf045382edb32bd763d8edea02a559e7dc41e9;p=pandora-kernel.git

n_tty: Protect minimum_to_wake reset for concurrent readers

With multiple, concurrent readers (each waiting to acquire the
atomic_read_lock mutex), a departing reader may mistakenly reset
minimum_to_wake after a new reader has already set a new value.

Protect the minimum_to_wake reset with the atomic_read_lock critical
section.

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