iio: core: Allow drivers to specify a label without it coming from of

mainline inclusion
from mainline-v5.13-rc1
commit 6f71bf19
category: bugfix
bugzilla: 185695 https://gitee.com/openeuler/kernel/issues/I4DDEL

Only set indio_dev->label from of/dt if there actually is a label
specified in of.

This allows drivers to set a label without this being overwritten with
NULL when there is no label specified in of. This is esp. useful on
devices where of is not used at all, such as your typical x86/ACPI device.
Signed-off-by: NHans de Goede <hdegoede@redhat.com>
Reviewed-by: NAlexandru Ardelean <alexandru.ardelean@analog.com>
Link: https://lore.kernel.org/r/20210207160901.110643-2-hdegoede@redhat.comSigned-off-by: NJonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Ntanghui <tanghui20@huawei.com>
Reviewed-by: NZhang Qiao <zhangqiao22@huawei.com>
Reviewed-by: NChen Hui <judy.chenhui@huawei.com>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

drivers/iio/industrialio-core.c

@@ -1720,6 +1720,7 @@ static const struct iio_buffer_setup_ops noop_ring_setup_ops;
 
 int __iio_device_register(struct iio_dev *indio_dev, struct module *this_mod)
 {
+	const char *label;
 	int ret;
 
 	if (!indio_dev->info)
@@ -1730,8 +1731,9 @@ int __iio_device_register(struct iio_dev *indio_dev, struct module *this_mod)
 	if (!indio_dev->dev.of_node && indio_dev->dev.parent)
 		indio_dev->dev.of_node = indio_dev->dev.parent->of_node;
 
-	indio_dev->label = of_get_property(indio_dev->dev.of_node, "label",
-					   NULL);
+	label = of_get_property(indio_dev->dev.of_node, "label", NULL);
+	if (label)
+		indio_dev->label = label;
 
 	ret = iio_check_unique_scan_index(indio_dev);
 	if (ret < 0)