linux-kernel - [PATCH 12/12] drivers: firmware: psci: add missing of_node_put after of_device_is

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Message-Id: <1550928043-14889-13-git-send-email-Julia.Lawall@lip6.fr>
Date:   Sat, 23 Feb 2019 14:20:43 +0100
From:   Julia Lawall <Julia.Lawall@...6.fr>
To:     Mark Rutland <mark.rutland@....com>
Cc:     kernel-janitors@...r.kernel.org,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH 12/12] drivers: firmware: psci: add missing of_node_put after of_device_is_available

Add an of_node_put when a tested device node is not available.

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

// <smpl>
@@
identifier f;
local idexpression e;
expression x;
@@

e = f(...);
... when != of_node_put(e)
    when != x = e
    when != e = x
    when any
if (<+...of_device_is_available(e)...+>) {
  ... when != of_node_put(e)
(
  return e;
|
+ of_node_put(e);
  return ...;
)
}
// </smpl>

Fixes: d09a0011ec0d5 ("drivers: psci: Allow PSCI node to be disabled")
Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>

---
 drivers/firmware/psci.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff -u -p a/drivers/firmware/psci.c b/drivers/firmware/psci.c
--- a/drivers/firmware/psci.c
+++ b/drivers/firmware/psci.c
@@ -677,8 +677,10 @@ int __init psci_dt_init(void)
 
 	np = of_find_matching_node_and_match(NULL, psci_of_match, &matched_np);
 
-	if (!np || !of_device_is_available(np))
+	if (!np || !of_device_is_available(np)) {
+		of_node_put(np);
 		return -ENODEV;
+	}
 
 	init_fn = (psci_initcall_t)matched_np->data;
 	return init_fn(np);