On March 19, 2014 6:50:44 PM GMT+00:00, Alec Berg <alecab...@chromium.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 <alecab...@chromium.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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