Lucid SRU: UBUNTU: SAUCE: igb: Protect stats update

[Stefan Bader]

On 21.09.2011 15:43, Tim Gardner wrote:
> This patch is a partial backport of upstream
> 12dcd86b75d571772512676ab301279952efc0b0. Its purpose is twofold; 1) Protect
> simultaneous readers and writers, 2) refresh statistics when read from ethtool.
> 
> rtg
> 
Wondering whether there is any chance of a running user task holding the
spinlock by that watchdog work...

Otherwise I guess it should ensure more regular task updates and the fencing of
consumers...