From: Alexander Duyck <alexander.h.duyck@intel.com>
Date: Thu, 16 Jan 2014 01:38:41 +0000 (-0800)
Subject: ixgbe: Clear head write-back registers on VF reset
X-Git-Tag: v3.14-rc1~94^2~150^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=dbf231af81a789645f7c8d7e3ddce48e1ef08083;p=pandora-kernel.git

ixgbe: Clear head write-back registers on VF reset

The Tx head write-back registers are not cleared during an FLR or VF reset.
As a result a configuration that had head write-back enabled can leave the
registers set after the driver is unloaded.  If the next driver loaded doesn't
use the write-back registers this can lead to a bad configuration where
head write-back is enabled, but the driver didn't request it.

To avoid this situation the PF should be resetting the Tx head write-back
registers when the VF requests a reset.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Tested-by: Phil Schmitt <phillip.j.schmitt@intel.com>
Signed-off-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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