Hello,

On Wed, Dec 26, 2012 at 09:42:14AM +0800, Aaron Lu wrote:

quoted

This is really a round-about way to find out the matching device and
it wouldn't work if the disk device nests deeper.  Doesn't really look
like a good idea to me.

I don't quite understand the 'disk device nests deeper' case, can you
please elaborate? My understanding is, as long as the disk's part0
device has a parent, this function should work. For LLDs want to take

Hmmm, maybe I misread but it looked like it wouldn't work if there are
intermediate nodes between the parent device and part0.  It might not
happen for sata but I don't think it's a good idea to assume that the
part0 and hardware device are connected directly.

In general, it's a quite roundabout way to do it.  Let's just push it
through SCSI.  That's how everything else is routed after all.  It's
confusing to do this one differently.

Thanks.

-- 
tejun