Re: [PATCH] iio: querying buffer scan_mask should return 0/1

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On 19/03/14 18:50, Alec Berg 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().

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@xxxxxxxxxxxx>
Applied to the fixes-togreg branch of iio.git and
marked for stable.

This will probably now go in shortly after rc1.

Thanks,

Jonathan
---
  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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