usb: dwc2: gadget: sparse warning of context imbalance

sparse was giving the following warning:
        warning: context imbalance in 's3c_hsotg_ep_enable'
	                - different lock contexts for basic block

we were returning ENOMEM while still holding the spinlock.
The sparse warning was fixed by releasing the spinlock before return.

Cc: <stable@vger.kernel.org> # v3.17
Acked-by: Paul Zimmerman <paulz@synopsys.com>
Signed-off-by: Sudip Mukherjee <sudip@vectorindia.org>
Signed-off-by: Felipe Balbi <balbi@ti.com>

diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c
index 7b5856f..7f25527 100644 (file)
--- a/drivers/usb/dwc2/gadget.c
+++ b/drivers/usb/dwc2/gadget.c
@@ -2561,8 +2561,10 @@ static int s3c_hsotg_ep_enable(struct usb_ep *ep,
                        hs_ep->fifo_size = val;
                        break;
                }
-               if (i == 8)
-                       return -ENOMEM;
+               if (i == 8) {
+                       ret = -ENOMEM;
+                       goto error;
+               }
        }
 
        /* for non control endpoints, set PID to D0 */
@@ -2579,6 +2581,7 @@ static int s3c_hsotg_ep_enable(struct usb_ep *ep,
        /* enable the endpoint interrupt */
        s3c_hsotg_ctrl_epint(hsotg, index, dir_in, 1);
 
+error:
        spin_unlock_irqrestore(&hsotg->lock, flags);
        return ret;
 }