Re: [PATCH v9 07/10] block: add a new interface to block events

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On Mon, 12 Nov 2012, Tejun Heo wrote:

> On Fri, Nov 09, 2012 at 02:51:59PM +0800, Aaron Lu wrote:
> > A new interface to block disk events is added, this interface is
> > meant to eliminate a race between PM runtime callback and disk events
> > checking.
> > 
> > Suppose the following device tree:
> > device_sata_port  (the parent)
> >   device_ODD      (the child)
> 
> Weren't you gonna do something different about this?  I mean, if sr
> knows that autopm kicked in, it can simply tell the block layer that
> nothing is going on.  Wouldn't that be simpler?

It wouldn't work for non-ZP drives.  They do need to be polled, even 
when suspended.

Alan Stern

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