linux-kernel - [PATCH 4.4 42/48] usb: renesas_usbhs: gadget: fix spin_lock

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Date:   Mon,  1 Jun 2020 19:53:52 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Kazuya Mizuguchi <kazuya.mizuguchi.ks@...esas.com>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        Felipe Balbi <felipe.balbi@...ux.intel.com>,
        Guenter Roeck <linux@...ck-us.net>
Subject: [PATCH 4.4 42/48] usb: renesas_usbhs: gadget: fix spin_lock_init() for &uep->lock

From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>

commit 14a8d4bfc2102f85ce097563d151370c91c1898a upstream.

This patch fixes an issue that the spin_lock_init() is not called
for almost all pipes. Otherwise, the lockdep output the following
message when we connect a usb cable using g_ncm:

 INFO: trying to register non-static key.
 the code is fine but needs lockdep annotation.
 turning off the locking correctness validator.

Reported-by: Kazuya Mizuguchi <kazuya.mizuguchi.ks@...esas.com>
Fixes: b8b9c974afee ("usb: renesas_usbhs: gadget: disable all eps when the driver stops")
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
Tested-by: Kazuya Mizuguchi <kazuya.mizuguchi.ks@...esas.com>
Signed-off-by: Felipe Balbi <felipe.balbi@...ux.intel.com>
Cc: Guenter Roeck <linux@...ck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/usb/renesas_usbhs/mod_gadget.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/usb/renesas_usbhs/mod_gadget.c
+++ b/drivers/usb/renesas_usbhs/mod_gadget.c
@@ -1103,7 +1103,6 @@ int usbhs_mod_gadget_probe(struct usbhs_
 		ret = -ENOMEM;
 		goto usbhs_mod_gadget_probe_err_gpriv;
 	}
-	spin_lock_init(&uep->lock);
 
 	gpriv->transceiver = usb_get_phy(USB_PHY_TYPE_UNDEFINED);
 	dev_info(dev, "%stransceiver found\n",
@@ -1151,6 +1150,7 @@ int usbhs_mod_gadget_probe(struct usbhs_
 		uep->ep.name		= uep->ep_name;
 		uep->ep.ops		= &usbhsg_ep_ops;
 		INIT_LIST_HEAD(&uep->ep.ep_list);
+		spin_lock_init(&uep->lock);
 
 		/* init DCP */
 		if (usbhsg_is_dcp(uep)) {