sparc: Add missing of_node_put

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;
struct device_node *n1;
statement S;
identifier f;
expression E;
expression *ptr != NULL;
@@

n@p1 = of_find_node_by_name(...)
...
if (!n) S
... when != of_node_put(n)
    when != n1 = f(n,...)
    when != E = n
    when any
    when strict
(
  return \(0\|<+...n...+>\|ptr\);
|
return@p2 ...;
|
  of_node_put(n);
|
  n1 = f(n,...)
|
  E = 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@diku.dk>
Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 0 deletions

diff --git a/arch/sparc/kernel/sun4m_irq.c b/arch/sparc/kernel/sun4m_irq.c
index f103171..301892e 100644
--- a/arch/sparc/kernel/sun4m_irq.c
+++ b/arch/sparc/kernel/sun4m_irq.c
@@ -374,6 +374,7 @@ static void __init sun4m_init_timers(irq_handler_t counter_fn)
 	}
 
 	addr = of_get_property(dp, "address", &len);
+	of_node_put(dp);
 	if (!addr) {
 		printk(KERN_ERR "sun4m_init_timers: No 'address' prop.\n");
 		return;
@@ -437,6 +438,7 @@ void __init sun4m_init_IRQ(void)
 	}
 
 	addr = of_get_property(dp, "address", &len);
+	of_node_put(dp);
 	if (!addr) {
 		printk(KERN_ERR "sun4m_init_IRQ: No 'address' prop.\n");
 		return;