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

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Message-Id: <200812021434.47010.npalix@diku.dk>
Date:	Tue, 2 Dec 2008 14:34:46 +0100
From:	Nicolas Palix <npalix@...u.dk>
To:	Paul Mackerras <paulus@...ba.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	linuxppc-dev@...abs.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org, Julia Lawall <julia@...u.dk>,
	Nicolas Palix <npalix@...u.dk>
Subject: [PATCH linux-next] powerpc/chrp: Add missing of_node_put in pci.c


of_node_put is needed before discarding a value received from
of_find_node_by_name, eg in error handling code or when the device
node is no longer used.

The semantic match that catches the bug is as follows:
(http://www.emn.fr/x-info/coccinelle/)

// <smpl>
@r exists@
local idexpression struct device_node *n;
position p1, p2;
statement S1,S2;
expression E,E1;
expression *ptr != NULL;
@@

(
if (!(n@p1 = of_find_node_by_name(...))) S1
|
n@p1 = of_find_node_by_name(...)
)
<... when != of_node_put(n)
    when != if (...) { <+... of_node_put(n) ...+> }
    when != true !n  || ...
    when != n = E
    when != E = n
if (!n || ...) S2
...>
(
  return \(0\|<+...n...+>\|ptr\);
|
return@p2 ...;
|
n = E1
|
E1 = n
)
@script:python@
p1 << r.p1;
p2 << r.p2;
@@

print "* file: %s of_find_node_by_name %s return %s" % (p1[0].file,p1[0].line,p2[0].line)
// </smpl>

Signed-off-by: Nicolas Palix <npalix@...u.dk>
Signed-off-by: Julia Lawall <julia@...u.dk>
---
 arch/powerpc/platforms/chrp/pci.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/arch/powerpc/platforms/chrp/pci.c b/arch/powerpc/platforms/chrp/pci.c
index d3cde6b..5a72ee5 100644
--- a/arch/powerpc/platforms/chrp/pci.c
+++ b/arch/powerpc/platforms/chrp/pci.c
@@ -141,6 +141,7 @@ hydra_init(void)
 		of_node_put(np);
 		return 0;
 	}
+	of_node_put(np);
 	Hydra = ioremap(r.start, r.end-r.start);
 	printk("Hydra Mac I/O at %llx\n", (unsigned long long)r.start);
 	printk("Hydra Feature_Control was %x",
-- 
Nicolas Palix
--
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