linux-kernel - Re: [PATCH] iio: Fix iio_channel_has

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Date:	Tue, 02 Jul 2013 22:10:24 +0100
From:	Jonathan Cameron <jic23@...nel.org>
To:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
CC:	Jonathan Cameron <jic23@....ac.uk>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Gregory Clement <gregory.clement@...e-electrons.com>,
	linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
	Lars-Peter Clausen <lars@...afoo.de>, stable@...r.kernel.org
Subject: Re: [PATCH] iio: Fix iio_channel_has_info

On 07/01/2013 03:20 PM, Alexandre Belloni wrote:
> Since the info_mask split, iio_channel_has_info() is not working correctly.
> info_mask_separate and info_mask_shared_by_type, it is not possible to compare
> them directly with the iio_chan_info_enum enum. Correct that bit using the BIT()
> macro.
> 
> Cc: <stable@...r.kernel.org> # 3.10.x
> Signed-off-by: Alexandre Belloni <alexandre.belloni@...e-electrons.com>
ouch / oops is about all I can say to this one.  Ideally might have had a note
in the description about what the effect of this bug is (breakage in the inkern interface)

Thanks and applied to the fixes-togreg branch of iio.git


> ---
>  include/linux/iio/iio.h | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/include/linux/iio/iio.h b/include/linux/iio/iio.h
> index 8d171f4..3d35b70 100644
> --- a/include/linux/iio/iio.h
> +++ b/include/linux/iio/iio.h
> @@ -211,8 +211,8 @@ struct iio_chan_spec {
>  static inline bool iio_channel_has_info(const struct iio_chan_spec *chan,
>  	enum iio_chan_info_enum type)
>  {
> -	return (chan->info_mask_separate & type) |
> -	       (chan->info_mask_shared_by_type & type);
> +	return (chan->info_mask_separate & BIT(type)) |
> +	       (chan->info_mask_shared_by_type & BIT(type));
>  }
>  
>  #define IIO_ST(si, rb, sb, sh)						\
> 
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