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

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Date:	Thu, 13 Aug 2015 15:13:44 +0200
From:	Johannes Berg <johannes@...solutions.net>
To:	Emmanuel Grumbach <egrumbach@...il.com>,
	"Fu, Zhonghui" <zhonghui.fu@...ux.intel.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>
Subject: Re: [PATCH] net/wireless: enable wiphy device to suspend/resume
 asynchronously

On Thu, 2015-07-30 at 08:55 +0300, Emmanuel Grumbach wrote:
> On Thu, Jul 30, 2015 at 8:18 AM, Fu, Zhonghui
> <zhonghui.fu@...ux.intel.com> wrote:
> > Enable wiphy device to suspend/resume asynchronously. This can 
> > improve
> > system suspend/resume speed.
> > 
> 
> How will that impact the timing with respect to the suspend call
> coming from the bus?
> I think that a few drivers rely on the suspend call of the wiphy
> device happening before the suspend call to the bus device.
> 

Yes, we can't do this for precisely this reason unless we have a way to
somehow keep the dependency between the two - possibly by also marking
the other one as async (although I don't know if the async framework in
general has any FIFO guarantees, which would be required for this.)

I've dropped the patch.

johannes
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