Neil Brown wrote:
> 
> On Wednesday April 23, Paul.Clements@SteelEye.com wrote:
> > Neil Brown wrote:

> It is possible for an array to be half-assembled.  To have some drives
> attached, but not to have been started.
> This can happen (for example) if you use mdadm to assemble a raid5
> array without given all of the drives, and without giving --run.
> 
> In this case you don't want 'md' to be unloaded, but you haven't
> loaded a personality module yet.  So you need to take a reference to
> the md module whenever you start putting an md array together.

Ah...I had missed that...appears that was an existing problem, even with
the MOD_INC_USE_COUNT in place. 

So we need to do the ref counting at bind/unbind time, rather than
activation/deactivation time.

So here's the patch...compiled and tested briefly against
2.5.68-bklatest, the ref counting looks correct

--
Paul