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From:   Arnd Bergmann <arnd@arndb.de>
To:     stable@vger.kernel.org,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        "Gustavo A. R. Silva" <gustavo@embeddedor.com>,
        Kees Cook <keescook@chromium.org>
Cc:     Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>,
        Felipe Balbi <felipe.balbi@linux.intel.com>,
        Arnd Bergmann <arnd@arndb.de>, linux-usb@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: [BACKPORT 4.4.y 22/25] usb: renesas_usbhs: gadget: fix unused-but-set-variable warning
Date:   Fri, 22 Mar 2019 16:44:13 +0100
Message-Id: <20190322154425.3852517-23-arnd@arndb.de>
In-Reply-To: <20190322154425.3852517-1-arnd@arndb.de>
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From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>

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@renesas.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
(cherry picked from commit b7d44c36a6f6d956e1539e0dd42f98b26e5a4684)
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 drivers/usb/renesas_usbhs/mod_gadget.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/usb/renesas_usbhs/mod_gadget.c b/drivers/usb/renesas_usbhs/mod_gadget.c
index 8647d2c2a8c4..c5553028e616 100644
--- a/drivers/usb/renesas_usbhs/mod_gadget.c
+++ b/drivers/usb/renesas_usbhs/mod_gadget.c
@@ -641,14 +641,11 @@ static int usbhsg_ep_disable(struct usb_ep *ep)
 	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);
-- 
2.20.0