[PATCH 5.15 076/779] iio: fix iio_format_avail_range() printing for none IIO_VAL_INT

[Greg Kroah-Hartman]

From: Fawzi Khaber <fawzi.khaber@xxxxxxx>

commit 5e1f91850365de55ca74945866c002fda8f00331 upstream.

iio_format_avail_range() should print range as follow [min, step, max], so
the function was previously calling iio_format_list() with length = 3,
length variable refers to the array size of values not the number of
elements. In case of non IIO_VAL_INT values each element has integer part
and decimal part. With length = 3 this would cause premature end of loop
and result in printing only one element.

Signed-off-by: Fawzi Khaber <fawzi.khaber@xxxxxxx>
Signed-off-by: Jean-Baptiste Maneyrol <jean-baptiste.maneyrol@xxxxxxx>
Fixes: eda20ba1e25e ("iio: core: Consolidate iio_format_avail_{list,range}()")
Link: https://lore.kernel.org/r/20220718130706.32571-1-jmaneyrol@xxxxxxxxxxxxxx
Cc: <Stable@xxxxxxxxxxxxxxx>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/iio/industrialio-core.c |   18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

--- a/drivers/iio/industrialio-core.c
+++ b/drivers/iio/industrialio-core.c
@@ -818,7 +818,23 @@ static ssize_t iio_format_avail_list(cha
 
 static ssize_t iio_format_avail_range(char *buf, const int *vals, int type)
 {
-	return iio_format_list(buf, vals, type, 3, "[", "]");
+	int length;
+
+	/*
+	 * length refers to the array size , not the number of elements.
+	 * The purpose is to print the range [min , step ,max] so length should
+	 * be 3 in case of int, and 6 for other types.
+	 */
+	switch (type) {
+	case IIO_VAL_INT:
+		length = 3;
+		break;
+	default:
+		length = 6;
+		break;
+	}
+
+	return iio_format_list(buf, vals, type, length, "[", "]");
 }
 
 static ssize_t iio_read_channel_info_avail(struct device *dev,