[Intel-wired-lan] [net PATCH v1] i40e: fix recursive rtnl lock

[Jesse Brandeburg <jesse.brandeburg@intel.com>]

On Thu, 24 Sep 2015 12:20:42 -0700
Jesse Brandeburg <jesse.brandeburg@intel.com> wrote:

> From: Anjali Singhai Jain <anjali.singhai@intel.com>
> 
> The sync_vsi_filters function can be called directly under RTNL
> or through the timer subtask without one.  This was causing
> a deadlock.

This patch was briefly tested, and does actually fix the bug it was
meant to fix, but this patch may cause bugs, one we thought of today was
if another thread grabs the RTNL, this patch will act as if it has it.

Another possible bug is that if another thread had the RTNL, it may
release it while this patch's thread is not completed all the way.

We are working on a further patch/refinement.