[PATCH] usb: gadget: f_rndis: fix interface id for OS descriptors

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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.

Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@xxxxxxxxxxx>
---
@Felipe:

Can you please consider it for 3.16? It is rebased onto a series
which does cleanup of the gadget directory.

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

diff --git a/drivers/usb/gadget/function/f_rndis.c b/drivers/usb/gadget/function/f_rndis.c
index eed3ad8..a7b6bbb 100644
--- a/drivers/usb/gadget/function/f_rndis.c
+++ b/drivers/usb/gadget/function/f_rndis.c
@@ -727,6 +727,10 @@ rndis_bind(struct usb_configuration *c, struct usb_function *f)
 	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;
-- 
1.8.3.2

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