From: Alex Elder <elder@inktank.com>
Date: Mon, 4 Feb 2013 16:13:11 +0000 (-0600)
Subject: xfs: memory barrier before wake_up_bit()
X-Git-Tag: v3.9-rc1~134^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=311f08acde635e4e5ccea9b9d8c856cc2e0ced95;p=pandora-kernel.git

xfs: memory barrier before wake_up_bit()

In xfs_ifunlock() there is a call to wake_up_bit() after clearing
the flush lock on the xfs inode.  This is not guaranteed to be safe,
as noted in the comments above wake_up_bit() beginning with:

    In order for this to function properly, as it uses
    waitqueue_active() internally, some kind of memory
    barrier must be done prior to calling this.


Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Dave Chinner <david@fromorbit.com>
Signed-off-by: Ben Myers <bpm@sgi.com>
---

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