[PATCH/RFC] net: Add __napi_sycnhronize() to sync with napi poll

[Benjamin Herrenschmidt]

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> > Note: unfortunately, Jeff already picked up the EMAC patch without
> > waiting for this to be sorted out (oops...). So if you agree with
> > this patch, it would be nice to have it go in quickly or maybe via
> > Jeff's tree to avoid breakage ? Not terribly important tho.
> 
> 
> Sorry, I thought that was the way everybody was headed.  With the driver 
> broken /anyway/, I just sorta threw it into the pile of fixes.
> 
> It's upstream now, so let me know if you want to revert or move forward 
> from here...

Let's just move forward. I can always re-fix the driver :-)

Ben.