[PATCH 2/5] usb: gadget: udc: renesas_usb3: fix deadlock by spinlock

[Yoshihiro Shimoda]

This patch fixes an issue that this driver is possible to cause
deadlock by double-spinclocked in renesas_usb3_stop_controller().
So, this patch removes spinlock API calling in renesas_usb3_stop().
(In other words, the previous code had a redundant lock.)

Fixes: 746bfe63bba3 ("usb: gadget: renesas_usb3: add support for Renesas USB3.0 
peripheral controller")
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda...@renesas.com>
---
 drivers/usb/gadget/udc/renesas_usb3.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/drivers/usb/gadget/udc/renesas_usb3.c 
b/drivers/usb/gadget/udc/renesas_usb3.c
index 10585da..e27d948 100644
--- a/drivers/usb/gadget/udc/renesas_usb3.c
+++ b/drivers/usb/gadget/udc/renesas_usb3.c
@@ -1810,14 +1810,11 @@ static int renesas_usb3_start(struct usb_gadget *gadget,
 static int renesas_usb3_stop(struct usb_gadget *gadget)
 {
        struct renesas_usb3 *usb3 = gadget_to_renesas_usb3(gadget);
-       unsigned long flags;
 
-       spin_lock_irqsave(&usb3->lock, flags);
        usb3->softconnect = false;
        usb3->gadget.speed = USB_SPEED_UNKNOWN;
        usb3->driver = NULL;
        renesas_usb3_stop_controller(usb3);
-       spin_unlock_irqrestore(&usb3->lock, flags);
 
        pm_runtime_put(usb3_to_dev(usb3));
        pm_runtime_disable(usb3_to_dev(usb3));
-- 
1.9.1