linux-kernel - Re: [PATCH V2] ARM: OMAP2+: omap_device: maintain sane runtime pm status around suspend/resume

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Message-ID: <52839306.7050701@ti.com>
Date:	Wed, 13 Nov 2013 08:56:06 -0600
From:	Nishanth Menon <nm@...com>
To:	<balbi@...com>
CC:	Tony Lindgren <tony@...mide.com>, <paul@...an.com>,
	<rnayak@...com>, <khilman@...aro.org>,
	<linux-omap@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V2] ARM: OMAP2+: omap_device: maintain sane runtime pm
 status around suspend/resume

On 11/13/2013 06:51 AM, Felipe Balbi wrote:
> Hi,
> 
> On Tue, Nov 12, 2013 at 05:08:30PM -0600, Nishanth Menon wrote:
>> diff --git a/arch/arm/mach-omap2/omap_device.c b/arch/arm/mach-omap2/omap_device.c
>> index b69dd9a..f97b34b 100644
>> --- a/arch/arm/mach-omap2/omap_device.c
>> +++ b/arch/arm/mach-omap2/omap_device.c
>> @@ -621,6 +621,7 @@ static int _od_suspend_noirq(struct device *dev)
>>  
>>  	if (!ret && !pm_runtime_status_suspended(dev)) {
>>  		if (pm_generic_runtime_suspend(dev) == 0) {
>> +			pm_runtime_set_suspended(dev);
> 
> don't you have to disable pm_runtime around status changes ? Or is
> pm_runtime already disabled by the time we get here ?

pm_runtime is already disabled by the time no_irq suspend is invoked.

> 
>> @@ -634,10 +635,10 @@ static int _od_resume_noirq(struct device *dev)
>>  	struct platform_device *pdev = to_platform_device(dev);
>>  	struct omap_device *od = to_omap_device(pdev);
>>  
>> -	if ((od->flags & OMAP_DEVICE_SUSPENDED) &&
>> -	    !pm_runtime_status_suspended(dev)) {
>> +	if (od->flags & OMAP_DEVICE_SUSPENDED) {
>>  		od->flags &= ~OMAP_DEVICE_SUSPENDED;
>>  		omap_device_enable(pdev);
>> +		pm_runtime_set_active(dev);
> 
> ditto, also pm_runtime_set_active() may fail.
> 
again, pm_runtime is not yet active here yet - we just restore the pm
runtime state with which we went down with -> and that is not expected
to fail either - So, how about just adding a WARN if our expectation
of balanced operation was somehow broken in the future with changes to
runtime framework?

-- 
Regards,
Nishanth Menon
--
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