usb: gadget: udc: renesas_usb3: Fix usb_gadget_giveback_request() calling

According to the gadget.h, a "complete" function will always be called
with interrupts disabled. However, sometimes usb3_request_done() function
is called with interrupts enabled. So, this function should be held
by spin_lock_irqsave() to disable interruption. Also, this driver has
to call spin_unlock() to avoid spinlock recursion by this driver before
calling usb_gadget_giveback_request().

Reported-by: Kazuya Mizuguchi <kazuya.mizuguchi.ks@renesas.com>
Tested-by: Kazuya Mizuguchi <kazuya.mizuguchi.ks@renesas.com>
Fixes: 746bfe63bba3 ("usb: gadget: renesas_usb3: add support for Renesas USB3.0 peripheral controller")
Cc: <stable@vger.kernel.org> # v4.5+
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

diff --git a/drivers/usb/gadget/udc/renesas_usb3.c b/drivers/usb/gadget/udc/renesas_usb3.c
index 62dc9c7798e78a034a9e63f8c3163fcebec9e57a..e1de8fe599a35695eceda22d3138492af8995b20 100644 (file)
--- a/drivers/usb/gadget/udc/renesas_usb3.c
+++ b/drivers/usb/gadget/udc/renesas_usb3.c
@@ -838,21 +838,32 @@ static struct renesas_usb3_request *usb3_get_request(struct renesas_usb3_ep
        return usb3_req;
 }
 
-static void usb3_request_done(struct renesas_usb3_ep *usb3_ep,
-                             struct renesas_usb3_request *usb3_req, int status)
+static void __usb3_request_done(struct renesas_usb3_ep *usb3_ep,
+                               struct renesas_usb3_request *usb3_req,
+                               int status)
 {
        struct renesas_usb3 *usb3 = usb3_ep_to_usb3(usb3_ep);
-       unsigned long flags;
 
        dev_dbg(usb3_to_dev(usb3), "giveback: ep%2d, %u, %u, %d\n",
                usb3_ep->num, usb3_req->req.length, usb3_req->req.actual,
                status);
        usb3_req->req.status = status;
-       spin_lock_irqsave(&usb3->lock, flags);
        usb3_ep->started = false;
        list_del_init(&usb3_req->queue);
-       spin_unlock_irqrestore(&usb3->lock, flags);
+       spin_unlock(&usb3->lock);
        usb_gadget_giveback_request(&usb3_ep->ep, &usb3_req->req);
+       spin_lock(&usb3->lock);
+}
+
+static void usb3_request_done(struct renesas_usb3_ep *usb3_ep,
+                             struct renesas_usb3_request *usb3_req, int status)
+{
+       struct renesas_usb3 *usb3 = usb3_ep_to_usb3(usb3_ep);
+       unsigned long flags;
+
+       spin_lock_irqsave(&usb3->lock, flags);
+       __usb3_request_done(usb3_ep, usb3_req, status);
+       spin_unlock_irqrestore(&usb3->lock, flags);
 }
 
 static void usb3_irq_epc_pipe0_status_end(struct renesas_usb3 *usb3)