[PATCH 3.16 22/63] usb: renesas_usbhs: gadget: fix unused-but-set-variable warning

[Ben Hutchings]

3.16.81-rc1 review patch.  If anyone has any objections, please let me know.

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

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

commit b7d44c36a6f6d956e1539e0dd42f98b26e5a4684 upstream.

The commit b8b9c974afee ("usb: renesas_usbhs: gadget: disable all eps
when the driver stops") causes the unused-but-set-variable warning.
But, if the usbhsg_ep_disable() will return non-zero value, udc/core.c
doesn't clear the ep->enabled flag. So, this driver should not return
non-zero value, if the pipe is zero because this means the pipe is
already disabled. Otherwise, the ep->enabled flag is never cleared
when the usbhsg_ep_disable() is called by the renesas_usbhs driver first.

Fixes: b8b9c974afee ("usb: renesas_usbhs: gadget: disable all eps when the driver stops")
Fixes: 11432050f070 ("usb: renesas_usbhs: gadget: fix NULL pointer dereference in ep_disable()")
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
Signed-off-by: Felipe Balbi <felipe.balbi@xxxxxxxxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
 drivers/usb/renesas_usbhs/mod_gadget.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

--- a/drivers/usb/renesas_usbhs/mod_gadget.c
+++ b/drivers/usb/renesas_usbhs/mod_gadget.c
@@ -611,14 +611,11 @@ static int usbhsg_ep_disable(struct usb_
 	struct usbhsg_uep *uep = usbhsg_ep_to_uep(ep);
 	struct usbhs_pipe *pipe;
 	unsigned long flags;
-	int ret = 0;
 
 	spin_lock_irqsave(&uep->lock, flags);
 	pipe = usbhsg_uep_to_pipe(uep);
-	if (!pipe) {
-		ret = -EINVAL;
+	if (!pipe)
 		goto out;
-	}
 
 	usbhsg_pipe_disable(uep);
 	usbhs_pipe_free(pipe);