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

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Date:	Mon, 11 Mar 2013 19:49:58 +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 07:41 PM, Alexander Shiyan wrote:
>> 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
> I.e. NULL, it is OK.

But what's the point of keeping it around?

> 
>> warnings from your compiler about unused functions.
> I think attribute "__maybe_unused" can help here.

Or a #ifdef

> 
>>>>  	},
>>>>  	.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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