linux-kernel - Re: [PATCH 3/3] driver: Add Legacy PM OPS usage check and warning to driver

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Message-id: <52C5EF46.1010806@samsung.com>
Date:	Thu, 02 Jan 2014 15:59:18 -0700
From:	Shuah Khan <shuah.kh@...sung.com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	gregkh@...uxfoundation.org, shuahkhan@...il.com,
	linux-kernel@...r.kernel.org, shuah Khan <shuah.kh@...sung.com>
Subject: Re: [PATCH 3/3] driver: Add Legacy PM OPS usage check and warning to
 driver_register()

On 12/23/2013 05:51 PM, Rafael J. Wysocki wrote:
> On Thursday, November 07, 2013 05:03:50 PM Shuah Khan wrote:
>> Add Legacy PM OPS usage checks to driver_register() function. If Legacy PM OPS
>> usage is found, print warning message to indicate the driver code needs
>> updating to use Dev PM OPS interfaces. This will help serve as a way to track
>> drivers that still use Legacy PM OPS and fix them.
>>
>> The Legacy PM OPS check looks for suspend(struct device *, pm_message_t) or
>> resume(struct device *) struct device_driver interfaces.
>>
>> Signed-off-by: Shuah Khan <shuah.kh@...sung.com>
>> ---
>>   drivers/base/driver.c | 4 ++++
>>   1 file changed, 4 insertions(+)
>>
>> diff --git a/drivers/base/driver.c b/drivers/base/driver.c
>> index 9e29943..10ff280 100644
>> --- a/drivers/base/driver.c
>> +++ b/drivers/base/driver.c
>> @@ -157,6 +157,10 @@ int driver_register(struct device_driver *drv)
>>   		printk(KERN_WARNING "Driver '%s' needs updating - please use "
>>   			"bus_type methods\n", drv->name);
>>
>> +	if (drv->suspend || drv->resume)
>> +		pr_warn("Please update driver '%s' to use dev pm ops.\n",
>> +			drv->name);
>
> What about the following message instead:
>
> 		pr_warn("Driver '%s' needs updating - please use the pm pointer.\n",
> 			drv->name);

I thought pm ops would be more informative for driver developers. That 
said, I will change the message and re-send the patch.

>
> And analogously for bus types and classes?
>
>> +
>>   	other = driver_find(drv->name, drv->bus);
>>   	if (other) {
>>   		printk(KERN_ERR "Error: Driver '%s' is already registered, "
>>
>
> Thanks!
>


-- 
Shuah Khan
Senior Linux Kernel Developer - Open Source Group
Samsung Research America(Silicon Valley)
shuah.kh@...sung.com | (970) 672-0658
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