linux-kernel - Re: [PATCH] iio: querying buffer scan

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Message-ID: <77ce5285-713f-4f2e-97b0-702c93404d82@email.android.com>
Date:	Wed, 19 Mar 2014 20:31:40 +0000
From:	Jonathan Cameron <jic23@...nel.org>
To:	Alec Berg <alecaberg@...omium.org>, linux-iio@...r.kernel.org
CC:	linux-kernel@...r.kernel.org,
	Vincent Palatin <vpalatin@...omium.org>, olof@...om.net
Subject: Re: [PATCH] iio: querying buffer scan_mask should return 0/1



On March 19, 2014 6:50:44 PM GMT+00:00, Alec Berg <alecaberg@...omium.org> wrote:
>Ensure that querying the IIO buffer scan_mask returns a value of
>0 or 1. Currently querying the scan mask has the value returned
>by test_bit(), which returns either true or false. For some
>architectures test_bit() may return -1 for true, which will appear
>to return an error when returning from iio_scan_mask_query().
I'm curious now.  Which architectures?  Change is fine BTW. Will pick when I get a few mins...
>
>Additionally, it's important for the sysfs interface to consistently
>return the same thing when querying the scan_mask.
>
>Signed-off-by: Alec Berg <alecaberg@...omium.org>
>---
> drivers/iio/industrialio-buffer.c | 6 ++++--
> 1 file changed, 4 insertions(+), 2 deletions(-)
>
>diff --git a/drivers/iio/industrialio-buffer.c
>b/drivers/iio/industrialio-buffer.c
>index c67d83b..fe25042 100644
>--- a/drivers/iio/industrialio-buffer.c
>+++ b/drivers/iio/industrialio-buffer.c
>@@ -165,7 +165,8 @@ static ssize_t iio_scan_el_show(struct device *dev,
> 	int ret;
> 	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
> 
>-	ret = test_bit(to_iio_dev_attr(attr)->address,
>+	/* Ensure ret is 0 or 1. */
>+	ret = !!test_bit(to_iio_dev_attr(attr)->address,
> 		       indio_dev->buffer->scan_mask);
> 
> 	return sprintf(buf, "%d\n", ret);
>@@ -866,7 +867,8 @@ int iio_scan_mask_query(struct iio_dev *indio_dev,
> 	if (!buffer->scan_mask)
> 		return 0;
> 
>-	return test_bit(bit, buffer->scan_mask);
>+	/* Ensure return value is 0 or 1. */
>+	return !!test_bit(bit, buffer->scan_mask);
> };
> EXPORT_SYMBOL_GPL(iio_scan_mask_query);
> 

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