On Sun, Feb 25 2001, Alexander Viro wrote:
> > > 	if (atomic_dec_and_test(...))
> > > 		up(...);
> > > not just
> > > 	atomic_dec(...);
> > > 	up(...);
> > > 
> > > Otherwise you can end up with too early exit of loop_thread. Normally
> > > it would not matter, but in pathological cases...
> > 
> > How so? We dec it and up the semaphore, loop_thread runs until it's
> > done and ups lo_sem.
> 
> You are risking an extra up() here. Think what happens if you already had a
> pending request.

Ah ok, I see what you mean. Updated patch attached.

-- 
Jens Axboe