From: Matthew Vick <matthew.vick@intel.com>
Date: Sat, 18 Aug 2012 07:26:33 +0000 (+0000)
Subject: igb: Prevent dropped Tx timestamps via work items and interrupts.
X-Git-Tag: omap-for-v3.7-rc1/fixes-cpufreq-signed~47^2~158
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1f6e8178d6851951876ad8524f4de7a0e6b111be;p=pandora-kernel.git

igb: Prevent dropped Tx timestamps via work items and interrupts.

In rare circumstances, it's possible a descriptor writeback will occur
before a timestamped Tx packet will go out on the wire, leading to the
driver believing the hardware failed to timestamp the packet. Schedule a
work item for 82576 and use the available time sync interrupt registers
on 82580 and above to account for this.

Cc: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: Matthew Vick <matthew.vick@intel.com>
Tested-by: Jeff Pieper <jeffrey.e.pieper@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
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