linux-kernel - Re: [PATCH 2/2] PM / sleep: prohibit devices probing during suspend/hibernation

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Date:	Thu, 8 Oct 2015 16:05:34 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Grygorii Strashko <grygorii.strashko@...com>
cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Pavel Machek <pavel@....cz>, Len Brown <len.brown@...el.com>,
	<linux-kernel@...r.kernel.org>, <linux-pm@...r.kernel.org>,
	Thierry Reding <thierry.reding@...il.com>
Subject: Re: [PATCH 2/2] PM / sleep: prohibit devices probing during
 suspend/hibernation

On Thu, 8 Oct 2015, Grygorii Strashko wrote:

> >>>> @@ -277,9 +304,15 @@ static DECLARE_WAIT_QUEUE_HEAD(probe_waitqueue);
> >>>>    
> >>>>    static int really_probe(struct device *dev, struct device_driver *drv)
> >>>>    {
> >>>> -	int ret = 0;
> >>>> +	int ret = -EPROBE_DEFER;
> >>>>    	int local_trigger_count = atomic_read(&deferred_trigger_count);
> >>>>    
> >>>> +	if (defer_all_probes) {
> 
> Will it be ok If I add below comment here?
> 		/*
> 		 * Value of defer_all_probes can be set only by
> 		 * device_defer_all_probes_enable() which, in turn, will call
> 		 * wait_for_device_probe() right after that to avoid any races.
> 		 */

That will help.  You could also add a comment where
wait_for_device_probe is called before device_defer_all_probes_enable,
explaining that is needed.

Alan Stern

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