linux-kernel - [PATCH 2/4] drivers/macintosh/smu.c: add missing of_node

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Message-ID: <Pine.LNX.4.64.0806091420080.16009@ask.diku.dk>
Date:	Mon, 9 Jun 2008 14:20:42 +0200 (CEST)
From:	Julia Lawall <julia@...u.dk>
To:	benh@...nel.crashing.org, linuxppc-dev@...abs.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH 2/4] drivers/macintosh/smu.c: add missing of_node_put

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

of_node_put is needed before discarding a value received from
of_find_node_by_type, eg in error handling code.

The semantic patch that makes the change is as follows:
(http://www.emn.fr/x-info/coccinelle/)

// <smpl>
@@
struct device_node *n;
struct device_node *n1;
struct device_node *n2;
statement S;
identifier f1,f2;
expression E1,E2;
constant C;
@@

n = of_find_node_by_type(...)
...
if (!n) S
... when != of_node_put(n)
    when != n1 = f1(n,...)
    when != E1 = n
    when any
    when strict
(
+ of_node_put(n);
  return -C;
|
  of_node_put(n);
|
  n2 = f2(n,...)
|
  E2 = n
|
  return ...;
)
// </smpl>

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

---

diff -u -p a/drivers/macintosh/smu.c b/drivers/macintosh/smu.c
--- a/drivers/macintosh/smu.c
+++ b/drivers/macintosh/smu.c
@@ -483,12 +483,15 @@ int __init smu_init (void)
 
 	if (smu_cmdbuf_abs == 0) {
 		printk(KERN_ERR "SMU: Command buffer not allocated !\n");
+		of_node_put(np);
 		return -EINVAL;
 	}
 
 	smu = alloc_bootmem(sizeof(struct smu_device));
-	if (smu == NULL)
+	if (smu == NULL) {
+		of_node_put(np);
 		return -ENOMEM;
+	}
 	memset(smu, 0, sizeof(*smu));
 
 	spin_lock_init(&smu->lock);
--
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