Re: [PATCH 0/6] PM: Asynchronous suspend and resume of devices

[Alan Stern]

On Wed, 26 Aug 2009, Rafael J. Wysocki wrote:

> Hi,
> 
> The following patches introduce a mechanism allowing us to execute device
> drivers' suspend and resume callbacks asynchronously during system sleep
> transitions, such as suspend to RAM.
> 
> The idea is explained in the changelogs of the first two patches.
> 
> Comments welcome.

I've been terribly busy and haven't had a chance to look at this.  The
earlier version seemed to have a bunch of mutual-exclusion issues; are
they resolved now?  There were also some problems involving unsafe
iteration over the dpm_list -- remember that devices can be
unregistered at any time, not just while they are suspending or
resuming.

When a device finishes, instead of having the async thread look for 
another device to work on, I think it would be better to have the 
thread check the dependents of the current device.  Those which are 
now ready can be added to a "device-ready" list, which is used to 
direct the actions of new async threads.

Alan Stern

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/