[dm-devel] Bisected, with rfc/patch - was Re: BUG: unable to handle kernel NULL pointer dereference at sysfs_do_create_link_sd (after mdadm)

[Christoph Hellwig]

On Fri, Apr 24, 2015 at 12:09:32PM +1000, NeilBrown wrote:
> I'm pretty sure that the md code is already as close to the "dm model" as it
> meaningfully can be.
> 
> If I move bdi_destroy out of blk_release_queue (which really think is too
> later) and place it in blk_cleanup_queue (which seems a credible place for
> it), and then move the blk_cleanup_queue call in md_free up before the
> del_gendisk() call (which is probably the right thing to do anyway, though dm
> has the same order that md currently has) then I don't get any crashes and
> I'm almost convince it is correct...

This looks reasonable to me, thanks.