[PATCH 3.16 108/357] usb: gadget: f_rndis: fix interface id for OS descriptors

[Greg Kroah-Hartman]

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

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

From: Andrzej Pietrasiewicz <andrzej.p@xxxxxxxxxxx>

commit 4546527350c3c508554dff53e9086e9d3de0b97b upstream.

f->os_desc_table[0].if_id is zero by default. If the actual id happens
to be different then no Feature Descriptors will be returned to the host
for this interface, so assign if_id as soon as it is known.

Acked-by: Michal Nazarewicz <mina86@xxxxxxxxxx>
Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@xxxxxxxxxxx>
Signed-off-by: Felipe Balbi <balbi@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>


---
 drivers/usb/gadget/f_rndis.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/usb/gadget/f_rndis.c
+++ b/drivers/usb/gadget/f_rndis.c
@@ -727,6 +727,10 @@ rndis_bind(struct usb_configuration *c,
 	rndis_control_intf.bInterfaceNumber = status;
 	rndis_union_desc.bMasterInterface0 = status;
 
+	if (cdev->use_os_string)
+		f->os_desc_table[0].if_id =
+			rndis_iad_descriptor.bFirstInterface;
+
 	status = usb_interface_id(c, f);
 	if (status < 0)
 		goto fail;


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