linux-kernel - [PATCH] mmc: atmel-mci: add missing of_node

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Date:   Sat, 15 Jul 2017 18:27:41 +0200
From:   Julia Lawall <Julia.Lawall@...6.fr>
To:     Ludovic Desroches <ludovic.desroches@...rochip.com>
Cc:     kernel-janitors@...r.kernel.org,
        Ulf Hansson <ulf.hansson@...aro.org>,
        linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] mmc: atmel-mci: add missing of_node_put

for_each_child_of_node performs an of_node_get on each iteration, so a
break out 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;
iterator name for_each_child_of_node;
@@

 for_each_child_of_node(e1,n) {
   ...
(
   of_node_put(n);
|
   e = n
|
+  of_node_put(n);
?  break;
)
   ...
 }
... when != n
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>

---
 drivers/mmc/host/atmel-mci.c |    1 +
 1 file changed, 1 insertion(+)

diff -u -p a/drivers/mmc/host/atmel-mci.c b/drivers/mmc/host/atmel-mci.c
--- a/drivers/mmc/host/atmel-mci.c
+++ b/drivers/mmc/host/atmel-mci.c
@@ -673,6 +673,7 @@ atmci_of_init(struct platform_device *pd
 		if (slot_id >= ATMCI_MAX_NR_SLOTS) {
 			dev_warn(&pdev->dev, "can't have more than %d slots\n",
 			         ATMCI_MAX_NR_SLOTS);
+			of_node_put(cnp);
 			break;
 		}