linux-kernel - [PATCH 1/10] drivers/char/hw_random/omap-rng.c: add missing clk

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Date:	Wed,  1 Jun 2011 19:10:04 +0200
From:	Julia Lawall <julia@...u.dk>
To:	Deepak Saxena <dsaxena@...xity.net>
Cc:	kernel-janitors@...r.kernel.org, Matt Mackall <mpm@...enic.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/10] drivers/char/hw_random/omap-rng.c: add missing clk_put

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

Convert a return to a jump to an existing label that calls clk_put.

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/char/hw_random/omap-rng.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/char/hw_random/omap-rng.c b/drivers/char/hw_random/omap-rng.c
index 2cc755a..b757fac 100644
--- a/drivers/char/hw_random/omap-rng.c
+++ b/drivers/char/hw_random/omap-rng.c
@@ -113,8 +113,10 @@ static int __devinit omap_rng_probe(struct platform_device *pdev)
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 
-	if (!res)
-		return -ENOENT;
+	if (!res) {
+		ret = -ENOENT;
+		goto err_region;
+	}
 
 	if (!request_mem_region(res->start, resource_size(res), pdev->name)) {
 		ret = -EBUSY;

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