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

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Date:	Mon, 17 Aug 2015 10:46:15 +0200
From:	Arend van Spriel <arend@...adcom.com>
To:	Johannes Berg <johannes@...solutions.net>,
	"Fu, Zhonghui" <zhonghui.fu@...ux.intel.com>,
	Emmanuel Grumbach <egrumbach@...il.com>
CC:	David Miller <davem@...emloft.net>,
	"linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Subject: Re: [PATCH] net/wireless: enable wiphy device to suspend/resume asynchronously

+ 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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