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> --- 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); -- 1.9.0.279.gdc9e3eb -- To unsubscribe from this list: send the line "unsubscribe linux-iio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
