From aa75db0080603bae27961c0502812dfd0f522bb3 Mon Sep 17 00:00:00 2001
From: Dan Williams <dan.j.williams@intel.com>
Date: Wed, 3 Mar 2010 21:21:10 -0700
Subject: [PATCH] ioat: close potential BUG_ON race in the descriptor cleanup
 path

Since ioat_cleanup_preamble() and the update of the last completed
descriptor are not synchronized there is a chance that two cleanup threads
can see descriptors to clean.  If the first cleans up all pending
descriptors then the second will trigger the BUG_ON.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
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