linux-kernel - Re: [PATCH] iio: st_magn: always define ST_MAGN_TRIGGER_SET

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Message-ID: <20160330063353.GA6253@beicxl1122>
Date:	Wed, 30 Mar 2016 14:33:53 +0800
From:	Denis Ciocca <denis.ciocca@...com>
To:	Arnd Bergmann <arnd@...db.de>
CC:	Jonathan Cameron <jic23@...nel.org>,
	Hartmut Knaack <knaack.h@....de>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Peter Meerwald <pmeerw@...erw.net>,
	Giuseppe BARBA <giuseppe.barba@...com>,
	Linus Walleij <linus.walleij@...aro.org>,
	"linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] iio: st_magn: always define ST_MAGN_TRIGGER_SET_STATE

Hi Arnd,

yup, my fault. Thanks.

Acked-by: Denis Ciocca <denis.ciocca@...com>


On |29 Mar 16 @ 22:27|, Arnd Bergmann wrote:
> When CONFIG_IIO_TRIGGER is enabled but CONFIG_IIO_BUFFER is
> not, we get a build error in the st_magn driver:
> 
> drivers/iio/magnetometer/st_magn_core.c:573:23: error: 'ST_MAGN_TRIGGER_SET_STATE' undeclared here (not in a function)
>   .set_trigger_state = ST_MAGN_TRIGGER_SET_STATE,
>                        ^~~~~~~~~~~~~~~~~~~~~~~~~
> 
> Apparently, this ST_MAGN_TRIGGER_SET_STATE macro was meant to
> be set to NULL when the definition is not available because
> st_magn_buffer.c is not compiled, but the alternative definition
> was not included in the original patch. This adds it.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> Fixes: 74f5683f35fe ("iio: st_magn: Add irq trigger handling")
> ---
>  drivers/iio/magnetometer/st_magn.h | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/iio/magnetometer/st_magn.h b/drivers/iio/magnetometer/st_magn.h
> index 06a4d9c35581..9daca4681922 100644
> --- a/drivers/iio/magnetometer/st_magn.h
> +++ b/drivers/iio/magnetometer/st_magn.h
> @@ -44,6 +44,7 @@ static inline int st_magn_allocate_ring(struct iio_dev *indio_dev)
>  static inline void st_magn_deallocate_ring(struct iio_dev *indio_dev)
>  {
>  }
> +#define ST_MAGN_TRIGGER_SET_STATE NULL
>  #endif /* CONFIG_IIO_BUFFER */
>  
>  #endif /* ST_MAGN_H */
> -- 
> 2.7.0
>