Re: [PATCH] net/wireless: enable wiphy device to suspend/resume asynchronously

[Arend van Spriel]

+ Rafael

On 08/17/2015 09:29 AM, Johannes Berg wrote:
> On Mon, 2015-08-17 at 09:48 +0800, Fu, Zhonghui wrote:
> > The suspend/resume timing of wiphy device and related devices will be
> > ensured by their parent/child relationship. So, enabling wiphy device
> > to suspend/resume asynchronously does not change any  dependency. It
> > can only take advantage of multicore and improve system
> > suspend/resume speed.
>
> You're going to have to explain that to me, because I don't see that.
> All I see is that when looking at a device, if async is possible, it
> gets added to an async work, and if async is not possible then it gets
> done immediately. Even putting aside the question of whether or not
> async is ordered or not (I don't know), if the wiphy is async and the
> PCI (or other bus) device isn't, then it seems they could get handled
> out of order, no? Or is there some magic code somewhere that I'm
> missing that explicitly waits for the async of the parent/child
> relationship?

This patch got me worried as well. Can't find the magic either. Maybe 
Rafael can give some hints here.

Regards,
Arend

> johannes
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