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

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On Sun, Nov 18, 2012 at 09:07:22PM -0500, Alan Stern wrote:
> Hey...

Hey, again. :P

> > So, at least for SATA, I think what autopm can do is...
> > 
> > * Trigger zpodd if possible.
> > 
> > * Trigger suspend iff polling isn't happening on the device.
> 
> That sums it up nicely.  Of course, the PM core is unaware of details
> such as media polling.  What we can do is have the SATA runtime-idle
> method return -EBUSY if the device isn't a ZPODD and if polling is
> enabled.  Unfortunately I don't think there's any way currently to
> trigger autopm when the user turns off polling.  Maybe something could
> be added to the appropriate sysfs handler.

Given that genhd event polling and PM are likely to interact with each
other, I think it would be a good idea to implement a proper way for
the two to communicate.  Dunno what it should be tho.  The tricky part
would be mapping the block device to the underlying hardware one.

Thanks.

-- 
tejun
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