On Sat, Sep 06, 2014 at 07:29:56AM +0900, Tejun Heo wrote:

It is for storage devices which always have guaranteed synchronous
probing on module load and well-defined probing order.  Sure, modern
setups are a lot more dynamic but I'm quite certain that there are
setups in the wild which depend on storage driver loading being
synchronous.  We can't simply declare one day that such behavior is
broken and break, most likely, their boots.

To add a bit, if the argument here is that dependency on such behavior
shouldn't exist and module loading and device probing should always be
asynchronous, the right approach is implementing "synchronous_probing"
flag not the other way around.  I actually wouldn't hate to see that
change happening but whoever submits and routes such a change should
be ready for a major shitstorm, I'm afraid.

Thanks.

-- 
tejun