linux-kernel - Re: [PATCH] iio: gyro: bmg160: only set power state if PM

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Date:	Sat, 06 Sep 2014 14:12:03 +0200
From:	Hartmut Knaack <knaack.h@....de>
To:	Irina Tirdea <irina.tirdea@...el.com>,
	Jonathan Cameron <jic23@...nel.org>, linux-iio@...r.kernel.org
CC:	Lars-Peter Clausen <lars@...afoo.de>,
	Peter Meerwald <pmeerw@...erw.net>,
	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iio: gyro: bmg160: only set power state if PM_RUNTIME
 is defined

Irina Tirdea schrieb:
> When CONFIG_PM_RUNTIME is not defined and bmg160 tries to power
> off the device, bmg160_set_power_state will call pm_runtime_put_autosuspend,
> which is not implemented (wil return -ENOSYS).
>
> Only call bmg160_set_power_state when CONFIG_PM_RUNTIME is defined.
Unless there is anything more to come, what about putting the #ifdef into first line inside bmg160_set_power_state() and just an #endif before the return 0 at the end? Saves 5 lines.
> Signed-off-by: Irina Tirdea <irina.tirdea@...el.com>
> Reviewed-by: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
> ---
>  drivers/iio/gyro/bmg160.c |    7 +++++++
>  1 file changed, 7 insertions(+)
>
> diff --git a/drivers/iio/gyro/bmg160.c b/drivers/iio/gyro/bmg160.c
> index 7524698..e41d6b5 100644
> --- a/drivers/iio/gyro/bmg160.c
> +++ b/drivers/iio/gyro/bmg160.c
> @@ -235,6 +235,7 @@ static int bmg160_chip_init(struct bmg160_data *data)
>  	return 0;
>  }
>  
> +#ifdef CONFIG_PM_RUNTIME
>  static int bmg160_set_power_state(struct bmg160_data *data, bool on)
>  {
>  	int ret;
> @@ -254,6 +255,12 @@ static int bmg160_set_power_state(struct bmg160_data *data, bool on)
>  
>  	return 0;
>  }
> +#else
> +static int bmg160_set_power_state(struct bmg160_data *data, bool on)
> +{
> +	return 0;
> +}
> +#endif
>  
>  static int bmg160_setup_any_motion_interrupt(struct bmg160_data *data,
>  					     bool status)

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