read sysfs attribute also from parent class device

Signed-off-by: Kay Sievers <kay.sievers@suse.de>

diff --git a/udev_rules.c b/udev_rules.c
index 6a485f0..d86b8e8 100644 (file)
--- a/udev_rules.c
+++ b/udev_rules.c
@@ -295,6 +295,7 @@ static int find_free_number(struct udevice *udev, const char *name)
 static int find_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device,
                                const char *name, char *value, size_t len)
 {
+       struct sysfs_class_device *class_dev_parent;
        struct sysfs_attribute *tmpattr;
 
        dbg("look for device attribute '%s'", name);
@@ -303,6 +304,12 @@ static int find_sysfs_attribute(struct sysfs_class_device *class_dev, struct sys
                tmpattr = sysfs_get_classdev_attr(class_dev, name);
                if (tmpattr)
                        goto attr_found;
+               class_dev_parent = sysfs_get_classdev_parent(class_dev);
+               if (class_dev_parent) {
+                       tmpattr = sysfs_get_classdev_attr(class_dev_parent, name);
+                       if (tmpattr)
+                               goto attr_found;
+               }
        }
        if (sysfs_device) {
                dbg("look for devices attribute '%s/%s'", sysfs_device->path, name);