linux-kernel - [PATCH] arch/powerpc: Add missing of_node

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Date:	Tue, 4 Dec 2007 11:10:46 +0100 (CET)
From:	Julia Lawall <julia@...u.dk>
To:	olof@...om.net, paulus@...ba.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [PATCH] arch/powerpc: Add missing of_node_put

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

There should be an of_node_put when breaking out of a loop that iterates
over calls to of_find_all_nodes, as this function does an of_node_get on
the value it returns.

This was fixed using the following semantic patch.
(http://www.emn.fr/x-info/coccinelle/)

// <smpl>
@@
type T;
identifier d;
expression e;
@@

T *d;
...
for (d = NULL; (d = of_find_all_nodes(d)) != NULL; )
 {... when != of_node_put(d)
      when != e = d
(
   return d;
|
+  of_node_put(d);
?  return ...;
)
...}
// </smpl>

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

diff -u -p a/arch/powerpc/platforms/iseries/iommu.c b/arch/powerpc/platforms/iseries/iommu.c
--- a/arch/powerpc/platforms/iseries/iommu.c	2007-12-01 17:56:55.000000000 +0100
+++ b/arch/powerpc/platforms/iseries/iommu.c	2007-12-02 16:39:23.000000000 +0100
@@ -163,8 +163,10 @@ static struct iommu_table *iommu_table_f
 		    (it->it_type == TCE_PCI) &&
 		    (it->it_offset == tbl->it_offset) &&
 		    (it->it_index == tbl->it_index) &&
-		    (it->it_size == tbl->it_size))
+		    (it->it_size == tbl->it_size)) {
+			of_node_put(node);
 			return it;
+		}
 	}
 	return NULL;
 }
--
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