From: Johan Hovold <jhovold@gmail.com>
Date: Mon, 26 May 2014 17:23:36 +0000 (+0200)
Subject: USB: cdc-acm: fix write and suspend race
X-Git-Tag: omap-for-v3.16/fixes-against-rc1~39^2~34^2~95
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5a345c20c17d87099224a4be12e69e5bd7023dca;p=pandora-kernel.git

USB: cdc-acm: fix write and suspend race

Fix race between write() and suspend() which could lead to writes being
dropped (or I/O while suspended) if the device is runtime suspended
while a write request is being processed.

Specifically, suspend() releases the write_lock after determining the
device is idle but before incrementing the susp_count, thus leaving a
window where a concurrent write() can submit an urb.

Fixes: 11ea859d64b6 ("USB: additional power savings for cdc-acm devices
that support remote wakeup")

Cc: <stable@vger.kernel.org>        # v2.6.27
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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