From: Johan Hovold <jhovold@gmail.com>
Date: Mon, 26 May 2014 17:23:37 +0000 (+0200)
Subject: USB: cdc-acm: fix write and resume race
X-Git-Tag: omap-for-v3.16/fixes-against-rc1~39^2~34^2~94
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e144ed28bed10684f9aaec6325ed974d53f76110;p=pandora-kernel.git

USB: cdc-acm: fix write and resume race

Fix race between write() and resume() due to improper locking that could
lead to writes being reordered.

Resume must be done atomically and susp_count be protected by the
write_lock in order to prevent racing with write(). This could otherwise
lead to writes being reordered if write() grabs the write_lock after
susp_count is decremented, but before the delayed urb is submitted.

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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