linux-kernel - [PATCH 3/10] drivers/usb/host/ohci-pxa27x.c: add missing clk

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Date:	Wed,  1 Jun 2011 19:10:06 +0200
From:	Julia Lawall <julia@...u.dk>
To:	David Brownell <dbrownell@...rs.sourceforge.net>
Cc:	kernel-janitors@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Eric Miao <eric.y.miao@...il.com>,
	Mike Rapoport <mike@...pulab.co.il>,
	Igor Grinberg <grinberg@...pulab.co.il>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 3/10] drivers/usb/host/ohci-pxa27x.c: add missing clk_put

From: Julia Lawall <julia@...u.dk>

Add a label before the call to clk_put and jump to that in the error
handling code that occurs after the call to clk_get has succeeded.

A simplified version of the semantic match that finds this problem is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@r exists@
expression e1,e2;
statement S;
@@

e1 = clk_get@p1(...);
... when != e1 = e2
    when != clk_put(e1)
    when any
if (...) { ... when != clk_put(e1)
               when != if (...) { ... clk_put(e1) ... }
* return@p3 ...;
 } else S
// </smpl>

Signed-off-by: Julia Lawall <julia@...u.dk>

---
 drivers/usb/host/ohci-pxa27x.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/host/ohci-pxa27x.c b/drivers/usb/host/ohci-pxa27x.c
index afef7b0..80be547 100644
--- a/drivers/usb/host/ohci-pxa27x.c
+++ b/drivers/usb/host/ohci-pxa27x.c
@@ -312,8 +312,10 @@ int usb_hcd_pxa27x_probe (const struct hc_driver *driver, struct platform_device
 		return PTR_ERR(usb_clk);
 
 	hcd = usb_create_hcd (driver, &pdev->dev, "pxa27x");
-	if (!hcd)
-		return -ENOMEM;
+	if (!hcd) {
+		retval = -ENOMEM;
+		goto err0;
+	}
 
 	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!r) {
@@ -368,6 +370,7 @@ int usb_hcd_pxa27x_probe (const struct hc_driver *driver, struct platform_device
 	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
  err1:
 	usb_put_hcd(hcd);
+ err0:
 	clk_put(usb_clk);
 	return retval;
 }

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