linux-kernel - [PATCH 1/3] arch/powerpc/platforms/pseries: Add missing of_node

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Date:	Tue, 1 Jan 2008 22:02:49 +0100 (CET)
From:	Julia Lawall <julia@...u.dk>
To:	paulus@...ibm.com, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [PATCH 1/3] arch/powerpc/platforms/pseries: Add missing of_node_put

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

Of_get_parent and of_find_compatible_node do an of_node_get, and thus a
corresponding of_code_put is needed in the error case.


The problem was found using the following semantic match.
(http://www.emn.fr/x-info/coccinelle/)

// <smpl>
@@
type T,T1,T2;
identifier E;
statement S;
expression x1,x2,x3;
int ret;
@@

  T E;
  ...
* E = \(of_get_parent\|of_find_compatible_node\)(...);
  if (E == NULL) S
  ... when != of_node_put(...,(T1)E,...)
      when != if (E != NULL) { ... of_node_put(...,(T1)E,...); ...}
      when != x1 = (T1)E
      when != E = x3;
      when any
  if (...) {
    ... when != of_node_put(...,(T2)E,...)
        when != if (E != NULL) { ... of_node_put(...,(T2)E,...); ...}
        when != x2 = (T2)E
(
*   return;
|
*   return ret;
)
  }
// </smpl>

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

diff -u -p a/arch/powerpc/platforms/pseries/reconfig.c b/arch/powerpc/platforms/pseries/reconfig.c
--- a/arch/powerpc/platforms/pseries/reconfig.c	2007-07-20 17:45:44.000000000 +0200
+++ b/arch/powerpc/platforms/pseries/reconfig.c	2008-01-01 14:33:54.000000000 +0100
@@ -167,6 +167,7 @@ static int pSeries_reconfig_remove_node(
 
 	if ((child = of_get_next_child(np, NULL))) {
 		of_node_put(child);
+		of_node_put(parent);
 		return -EBUSY;
 	}
 
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