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

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Message-ID: <5617CFBC.1090409@ti.com>
Date:	Fri, 9 Oct 2015 09:31:24 -0500
From:	Grygorii Strashko <grygorii.strashko@...com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Alan Stern <stern@...land.harvard.edu>
CC:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	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 10/08/2015 03:46 PM, Rafael J. Wysocki wrote:
> On Thursday, October 08, 2015 03:20:08 PM Alan Stern wrote:
>> On Thu, 8 Oct 2015, Grygorii Strashko wrote:
>>
>>>>>    /**
>>>>> + * device_defer_all_probes() - Enable/disable probing of devices
>>>>> + * @enable:  Enable/disable probing of devices
>>>>> + *
>>>>> + * if @enable = true
>>>>> + *	It will disable probing of devices and defer their probes.
>>>>> + * otherwise
>>>>> + *	It will restore normal behavior and trigger re-probing of deferred
>>>>> + *	devices.
>>>>> + */
>>>>> +void device_defer_all_probes(bool enable)
>>>>> +{
>>>>> +	defer_all_probes = enable;
>>>>> +	if (enable)
>>>>> +		/* sync with probes to avoid any races. */
>>>>> +		wait_for_device_probe();
>>>
>>> ^ pls, pay attention on above code line
>>>
>>>>> +	else
>>>>> +		driver_deferred_probe_trigger();
>>>>> +}
>>>>
>>>> Some people might prefer to see two separate functions, an enable
>>>> routine and a disable routine.  I don't much care.
>>>
>>> May be. Should I change it?
>>
>> It would then be more in line with functions like
>> pm_runtime_set_{active|suspended} or pm_runtime_[dont_]use_autosuspend.
>
> Also it would be cleaner code without conditionals:
>
> enable:
> 	defer_all_probes = true;
> 	wait_for_device_probe();
>
> disable:
> 	defer_all_probes = false;
> 	driver_deferred_probe_trigger();
>
> Cleaner, no?
>

NP. Will do.

-- 
regards,
-grygorii
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