usb: gadget: rndis: Fix re-binding f_rndis

f_rndis checks if rndis_string_defs[0].id is null to setup rndis
and allocate string ids when it is bound to the first configuration:

	/* maybe allocate device-global string IDs */
	if (rndis_string_defs[0].id == 0) {

		/* ... and setup RNDIS itself */
		status = rndis_init();
		if (status < 0)
			return status;

rndis_string_defs[0].id must be reset to 0 on unbind for rndis to be
correctly initialized on the next composite_bind.

Signed-off-by: Benoit Goby <benoit@android.com>
Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Acked-by: Michal Nazarewicz <mina86@mina86.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/gadget/f_rndis.c b/drivers/usb/gadget/f_rndis.c
index 52343654f5df5218929e86bf7bdac64bf2577b9e..241225a37649a21452645fccbd3fc515ea5d5367 100644 (file)
--- a/drivers/usb/gadget/f_rndis.c
+++ b/drivers/usb/gadget/f_rndis.c
@@ -820,6 +820,7 @@ rndis_unbind(struct usb_configuration *c, struct usb_function *f)
 
        rndis_deregister(rndis->config);
        rndis_exit();
+       rndis_string_defs[0].id = 0;
 
        if (gadget_is_superspeed(c->cdev->gadget))
                usb_free_descriptors(f->ss_descriptors);