[PATCH v2] cpufreq: s5pv210: add missing of_node

Julia Lawall

2017-07-21 19:53:30 UTC

for_each_compatible_node performs an of_node_get on each iteration, so a
return from the loop requires an of_node_put.

The semantic patch that fixes this problem is as follows
(http://coccinelle.lip6.fr):

// <smpl>
@@
local idexpression n;
expression e,e1,e2;
statement S;
iterator i1;
iterator name for_each_compatible_node;
@@

for_each_compatible_node(n,e1,e2) {
...
(
of_node_put(n);
|
e = n
|
return n;
|
i1(...,n,...) S
|
+ of_node_put(n);
? return ...;
)
...
}
// </smpl>

Additionally, call of_node_put on the previous value of np, obtained from
of_find_compatible_node, that is no longer accessible at the point of the
for_each_compatible_node.

Signed-off-by: Julia Lawall <***@lip6.fr>

---

v2: add the of_node_put for the call to of_find_compatible_node as well.

drivers/cpufreq/s5pv210-cpufreq.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/cpufreq/s5pv210-cpufreq.c b/drivers/cpufreq/s5pv210-cpufreq.c
index f82074e..5d31c2d 100644
--- a/drivers/cpufreq/s5pv210-cpufreq.c
+++ b/drivers/cpufreq/s5pv210-cpufreq.c
@@ -602,6 +602,7 @@ static int s5pv210_cpufreq_probe(struct platform_device *pdev)
}

clk_base = of_iomap(np, 0);
+ of_node_put(np);
if (!clk_base) {
pr_err("%s: failed to map clock registers\n", __func__);
return -EFAULT;
@@ -612,6 +613,7 @@ static int s5pv210_cpufreq_probe(struct platform_device *pdev)
if (id < 0 || id >= ARRAY_SIZE(dmc_base)) {
pr_err("%s: failed to get alias of dmc node '%s'\n",
__func__, np->name);
+ of_node_put(np);
return id;
}

@@ -619,6 +621,7 @@ static int s5pv210_cpufreq_probe(struct platform_device *pdev)
if (!dmc_base[id]) {
pr_err("%s: failed to map dmc%d registers\n",
__func__, id);
+ of_node_put(np);
return -EFAULT;
}
}