From: Dean Nelson <dcn@sgi.com>
Date: Tue, 8 Aug 2006 20:03:29 +0000 (-0500)
Subject: [IA64-SGI] Silent data corruption caused by XPC V2.
X-Git-Tag: v2.6.18-rc6~36^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7682a4c624e0011b5f3e8dd3021dc54961260d97;p=pandora-kernel.git

[IA64-SGI] Silent data corruption caused by XPC V2.

Jack Steiner identified a problem where XPC can cause a silent
data corruption.  On module load, the placement may cause the
xpc_remote_copy_buffer to span two physical pages.  DMA transfers are
done to the start virtual address translated to physical.

This patch changes the buffer from a statically allocated buffer to a
kmalloc'd buffer.  Dean Nelson reviewed this before posting.  I have
tested it in the configuration that was showing the memory corruption
and verified it works.  I also added a BUG_ON statement to help catch
this if a similar situation is encountered.

Signed-off-by: Robin Holt <holt@sgi.com>
Signed-off-by: Dean Nelson <dcn@sgi.com>
Signed-off-by: Jack Steiner <steiner@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
---

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