linux-kernel - Re: [PATCH] driver core: Ensure proper suspend/resume ordering

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Message-ID: <CAJZ5v0gEMhJaJa6m7Sq41oottuJW+0XJRpxsWHNdUsbVmNHeDw@mail.gmail.com>
Date:	Thu, 17 Sep 2015 20:15:49 +0200
From:	"Rafael J. Wysocki" <rafael@...nel.org>
To:	Tomeu Vizoso <tomeu.vizoso@...labora.com>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Alan Stern <stern@...land.harvard.edu>,
	Thierry Reding <thierry.reding@...il.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Grygorii Strashko <grygorii.strashko@...com>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] driver core: Ensure proper suspend/resume ordering

Hi,

On Thu, Sep 17, 2015 at 7:40 AM, Tomeu Vizoso
<tomeu.vizoso@...labora.com> wrote:
> On 17 September 2015 at 02:27, Rafael J. Wysocki <rjw@...ysocki.net> wrote:
>> On Wednesday, September 16, 2015 03:22:37 PM Alan Stern wrote:
>>>
>>> It would also help if your patch checked to see if the device has any
>>> children, and avoided moving it to the end of the list if it does.  In
>>> fact, that might be sufficient to avoid almost all problems.
>>
>> I agree.
>>
>> In any case if a device that already has children is about to be probed,
>> this is sort of a corner case anyway and should be handled as such.
>
> Just wanted to mention that it's very common in platforms that make
> use of DT to have some devices registered before their parents have probed.
> If I grep for DTS with simple-bus and simple-mfd I get 802 matches.


This is good to know, thanks!

Rafael
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