From: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
Date: Fri, 26 Jun 2015 01:28:24 +0000 (+0200)
Subject: xen/gntdevt: Fix race condition in gntdev_release()
X-Git-Tag: omap-for-v4.3/fixes-merge-window~142^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=30b03d05e07467b8c6ec683ea96b5bffcbcd3931;p=pandora-kernel.git

xen/gntdevt: Fix race condition in gntdev_release()

While gntdev_release() is called the MMU notifier is still registered
and can traverse priv->maps list even if no pages are mapped (which is
the case -- gntdev_release() is called after all). But
gntdev_release() will clear that list, so make sure that only one of
those things happens at the same time.

Signed-off-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
---

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