[PATCH 4.13 054/160] usb: gadget: udc: renesas_usb3: fix for no-data control transfer

From: Greg Kroah-Hartman
Date: Tue Oct 10 2017 - 16:02:00 EST


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

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

From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>

commit 4dcf4bab4a409e81284b8202137e4a85b96b34de upstream.

When bRequestType & USB_DIR_IN is false and req.length is 0 in control
transfer, since it means non-data, this driver should not set the mode
as control write. So, this patch fixes it.

Fixes: 746bfe63bba3 ("usb: gadget: renesas_usb3: add support for Renesas USB3.0 peripheral controller")
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
Signed-off-by: Felipe Balbi <felipe.balbi@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
drivers/usb/gadget/udc/renesas_usb3.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/usb/gadget/udc/renesas_usb3.c
+++ b/drivers/usb/gadget/udc/renesas_usb3.c
@@ -1144,7 +1144,8 @@ static void usb3_start_pipe0(struct rene
usb3_set_p0_con_for_ctrl_read_data(usb3);
} else {
usb3_clear_bit(usb3, P0_MOD_DIR, USB3_P0_MOD);
- usb3_set_p0_con_for_ctrl_write_data(usb3);
+ if (usb3_req->req.length)
+ usb3_set_p0_con_for_ctrl_write_data(usb3);
}

usb3_p0_xfer(usb3_ep, usb3_req);