From: Oliver Neukum <oneukum@suse.de>
Date: Mon, 19 May 2014 11:53:55 +0000 (+0200)
Subject: USB: appledisplay: fix race between reading and writing from the device
X-Git-Tag: omap-for-v3.16/fixes-against-rc1~39^2~34^2~46
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=552e1f2679b7b766b8b8de3dc6d83d9cd28f28b2;p=pandora-kernel.git

USB: appledisplay: fix race between reading and writing from the device

The workqueue handler may call appledisplay_bl_get_brightness() while
user space calls appledisplay_bl_update_status(). As they share a
buffer that must not happen. Use a mutex for mutual exclusion.

Signed-off-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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