linux-kernel - Re: [PATCH] i2c-designware-pcidrv: fix the incorrect return of idle callback

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Date:	Wed, 29 Jan 2014 10:03:33 +0800
From:	"xinhui.pan" <xinhuix.pan@...el.com>
To:	Wolfram Sang <wsa@...-dreams.de>
CC:	linux-kernel@...r.kernel.org, linux-i2c@...r.kernel.org,
	mika.westerberg@...ux.intel.com, andriy.shevchenko@...ux.intel.com,
	yanmin_zhang@...ux.intel.com, bo.he@...el.com
Subject: Re: [PATCH] i2c-designware-pcidrv: fix the incorrect return of idle
 callback


> On Tue, Jan 28, 2014 at 01:48:28PM +0800, xinhui.pan wrote:
>> From: "xinhui.pan" <xinhuix.pan@...el.com>
>>
>> i2c_dw_pci_runtime_idle should return -EBUSY rather than zero if it do success.
> 
> I don't understand...
> 
Sorry for my poor English. 
Even if i2c_dw_pci_runtime_idle succeed ,it should return -EBUSY.
>> Otherwise rpm_idle will call pm_suspend again and that may cause pm_schedule_suspend delay invalidate.
>> 	
>> Signed-off-by: bo.he <bo.he@...el.com>
>> Signed-off-by: xinhui.pan <xinhuix.pan@...el.com>
>> ---
>>  drivers/i2c/busses/i2c-designware-pcidrv.c |    4 ++--
>>  1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/i2c/busses/i2c-designware-pcidrv.c b/drivers/i2c/busses/i2c-designware-pcidrv.c
>> index f6ed06c..96e81f6 100644
>> --- a/drivers/i2c/busses/i2c-designware-pcidrv.c
>> +++ b/drivers/i2c/busses/i2c-designware-pcidrv.c
>> @@ -190,8 +190,8 @@ static int i2c_dw_pci_runtime_idle(struct device *dev)
>>  	int err = pm_schedule_suspend(dev, 500);
>>  	dev_dbg(dev, "runtime_idle called\n");
>>  
>> -	if (err != 0)
>> -		return 0;
>> +	if (err)
>> +		return err;
>>  	return -EBUSY;
> 
> ... it does return EBUSY when pm_schedule_suspend() succeeds? It only
> returns 0 if it does not succeed (for which I don't know if this is an
> apropriate behaviour). Mika?
> 
>>  }
>>  
>> -- 
>> 1.7.9.5
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