[PATCH 4.14 096/107] usb: common: Consider only available nodes for dr_mode

[Greg Kroah-Hartman]

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Fabrizio Castro <fabrizio.castro@xxxxxxxxxxxxxx>

commit 238e0268c82789e4c107a37045d529a6dbce51a9 upstream.

There are cases where multiple device tree nodes point to the
same phy node by means of the "phys" property, but we should
only consider those nodes that are marked as available rather
than just any node.

Fixes: 98bfb3946695 ("usb: of: add an api to get dr_mode by the phy node")
Cc: stable@xxxxxxxxxxxxxxx # v4.4+
Signed-off-by: Fabrizio Castro <fabrizio.castro@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/usb/common/common.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/usb/common/common.c
+++ b/drivers/usb/common/common.c
@@ -148,6 +148,8 @@ enum usb_dr_mode of_usb_get_dr_mode_by_p
 
 	do {
 		controller = of_find_node_with_property(controller, "phys");
+		if (!of_device_is_available(controller))
+			continue;
 		index = 0;
 		do {
 			if (arg0 == -1) {