Re: [PATCH 1/2] drivers: core: Don't try to use a dead glue_dir

[Benjamin Herrenschmidt]

On Sat, 2018-07-21 at 09:53 +0200, Greg Kroah-Hartman wrote:
> > > So I hate using kobject_get_unless_zero(), and resisted ever adding it
> > > to the tree as it shows a bad locking/tree situation as you point out
> > > here.  But for some reason, the block developers seemed to insist they
> > > needed it, and so it is in the tree for them.  I don't want it to spread
> > > if at all possible, which makes me want to reject this patch as this
> > > should be "a case that can never be hit".
> > 
> > Except it can in that situation... at least unless you get my patch 2/2
> > (or the newer one I'm about to send that avoids adding a child counter
> > and uses the one in kernfs instead).
> 
> To follow up on this.  I've applied the 2/2 patch for this series, so
> this 1/2 "should" not be needed.  Ben, if you still see this trigger
> with that, I guess I can take this, but it still feels wrong to me :)

I've tested my repro-case with only patch 2 and it doesn't trigger
anymore, as expected.

That said, you and Linus might want to sync your clocks on how sysfs
"should" work :-)

Cheers,
Ben.