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iio: querying buffer scan_mask should return 0/1 

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@chromium.org>
Cc: stable@vger.kernel.org
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Alec Berg 2014-03-19 18:50:00 +00:00 committed by Jonathan Cameron
parent 6b9da2e772
commit 2076a20fc1
1 changed files with 4 additions and 2 deletions
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6
drivers/iio/industrialio-buffer.c
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@ -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);