linux-kernel - Re: [PATCH 2/4] tty: max310x: Use dev_pm

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Date:	Mon, 11 Mar 2013 19:35:06 +0100
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	Alexander Shiyan <shc_work@...l.ru>
CC:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] tty: max310x: Use dev_pm_ops

On 03/11/2013 07:10 PM, Alexander Shiyan wrote:
> Hello.
> 
>> Use dev_pm_ops instead of the deprecated legacy suspend/resume for the
>> max310x driver.
>>
>> Cc: Alexander Shiyan <shc_work@...l.ru>
>> Signed-off-by: Lars-Peter Clausen <lars@...afoo.de>
>> ---
>>  drivers/tty/serial/max310x.c | 24 ++++++++++++++++--------
>>  1 file changed, 16 insertions(+), 8 deletions(-)
>>
>> diff --git a/drivers/tty/serial/max310x.c b/drivers/tty/serial/max310x.c
>> index 0c2422c..8941e64 100644
>> --- a/drivers/tty/serial/max310x.c
>> +++ b/drivers/tty/serial/max310x.c
>> @@ -881,12 +881,14 @@ static struct uart_ops max310x_ops = {
>>  	.verify_port	= max310x_verify_port,
>>  };
>>  
>> -static int max310x_suspend(struct spi_device *spi, pm_message_t state)
>> +#ifdef CONFIG_PM_SLEEP
>> +
>> +static int max310x_suspend(struct device *dev)
>>  {
>>  	int ret;
>> -	struct max310x_port *s = dev_get_drvdata(&spi->dev);
>> +	struct max310x_port *s = dev_get_drvdata(dev);
>>  
>> -	dev_dbg(&spi->dev, "Suspend\n");
>> +	dev_dbg(dev, "Suspend\n");
>>  
>>  	ret = uart_suspend_port(&s->uart, &s->port);
>>  
>> @@ -905,11 +907,11 @@ static int max310x_suspend(struct spi_device *spi, pm_message_t state)
>>  	return ret;
>>  }
>>  
>> -static int max310x_resume(struct spi_device *spi)
>> +static int max310x_resume(struct device *dev)
>>  {
>> -	struct max310x_port *s = dev_get_drvdata(&spi->dev);
>> +	struct max310x_port *s = dev_get_drvdata(dev);
>>  
>> -	dev_dbg(&spi->dev, "Resume\n");
>> +	dev_dbg(dev, "Resume\n");
>>  
>>  	if (s->pdata->suspend)
>>  		s->pdata->suspend(0);
>> @@ -928,6 +930,13 @@ static int max310x_resume(struct spi_device *spi)
>>  	return uart_resume_port(&s->uart, &s->port);
>>  }
>>  
>> +static SIMPLE_DEV_PM_OPS(max310x_pm_ops, max310x_suspend, max310x_resume);
>> +#define MAX310X_PM_OPS (&max310x_pm_ops)
>> +
>> +#else
>> +#define MAX310X_PM_OPS NULL
>> +#endif
>> +
>>  #ifdef CONFIG_GPIOLIB
>>  static int max310x_gpio_get(struct gpio_chip *chip, unsigned offset)
>>  {
>> @@ -1242,11 +1251,10 @@ static struct spi_driver max310x_driver = {
>>  	.driver = {
>>  		.name	= "max310x",
>>  		.owner	= THIS_MODULE,
>> +		.pm	= MAX310X_PM_OPS,
> 
> Check for CONFIG_PM_SLEEP not necessary at all.
> <linux/pm.h> will do all for us.

No it wont, you'll end up with a dev_pm_ops struct full of zeros and two
warnings from your compiler about unused functions.

> 
>>  	},
>>  	.probe		= max310x_probe,
>>  	.remove		= max310x_remove,
>> -	.suspend	= max310x_suspend,
>> -	.resume		= max310x_resume,
>>  	.id_table	= max310x_id_table,
>>  };
>>  module_spi_driver(max310x_driver);
>> -- 
>> 1.8.0
> 
> ---

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