From: Ben Hutchings <bhutchings@solarflare.com>
Date: Thu, 1 Sep 2011 12:09:29 +0000 (+0000)
Subject: Revert "sfc: Use write-combining to reduce TX latency" and follow-ups
X-Git-Tag: v3.1-rc7~25^2~17
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=86c432ca5d6da90a26ac8d3e680f2268b502d9c5;p=pandora-kernel.git

Revert "sfc: Use write-combining to reduce TX latency" and follow-ups

This reverts commits 65f0b417dee94f779ce9b77102b7d73c93723b39,
d88d6b05fee3cc78e5b0273eb58c31201dcc6b76,
fcfa060468a4edcf776f0c1211d826d5de1668c1,
747df2258b1b9a2e25929ef496262c339c380009 and
867955f5682f7157fdafe8670804b9f8ea077bc7.

Depending on the processor model, write-combining may result in
reordering that the NIC will not tolerate.  This typically results
in a DMA error event and reset by the driver, logged as:

sfc 0000:0e:00.0: eth2: TX DMA Q reports TX_EV_PKT_ERR.
sfc 0000:0e:00.0: eth2: resetting (ALL)

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

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