From ed4420a3b412b09cc60d6e3d662428b7e6c36e90 Mon Sep 17 00:00:00 2001
From: Jakub Kicinski <kubakici@wp.pl>
Date: Sat, 15 Mar 2014 14:55:32 +0000
Subject: [PATCH] igb: fix race conditions on queuing skb for HW time stamp

igb has a single set of TX time stamping resources per NIC.
Use a simple bit lock to avoid race conditions and leaking skbs
when multiple TX rings try to claim time stamping.

Signed-off-by: Jakub Kicinski <kubakici@wp.pl>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
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