linux-kernel - [PATCH v3 1/2] usb: dwc2: gadget: sparse warning of context imbalance

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Message-Id: <1413521043-7587-1-git-send-email-sudipm.mukherjee@gmail.com>
Date:	Fri, 17 Oct 2014 10:14:02 +0530
From:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
To:	Paul Zimmerman <paulz@...opsys.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Sudip Mukherjee <sudipm.mukherjee@...il.com>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v3 1/2] 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.

Signed-off-by: Sudip Mukherjee <sudip@...torindia.org>
---
 drivers/usb/dwc2/gadget.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c
index 7b5856f..7f25527 100644
--- 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;
 }
-- 
1.8.1.2

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