[PATCH 0/5] add missing of_node_put

The device node iterators perform an of_node_get on each iteration, so a
jump out of the loop requires an of_node_put.

---

 drivers/gpu/drm/rockchip/rockchip_lvds.c   |    4 +++-
 drivers/pci/hotplug/pnv_php.c              |    8 ++++++--
 drivers/phy/hisilicon/phy-hisi-inno-usb2.c |    9 +++++++--
 drivers/pinctrl/pinctrl-at91-pio4.c        |    4 +++-
 drivers/soc/ti/knav_dma.c                  |    1 +
 5 files changed, 20 insertions(+), 6 deletions(-)

The device node iterators perform an of_node_get on each iteration, so a
jump out of the loop requires an of_node_put.

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

// <smpl>
@@
expression root,e;
local idexpression child;
iterator name for_each_child_of_node;
@@

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

Signed-off-by: Julia Lawall <redacted>

---
 drivers/pci/hotplug/pnv_php.c |    8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/hotplug/pnv_php.c b/drivers/pci/hotplug/pnv_php.c
index d441006..6c2e8d7 100644
--- a/drivers/pci/hotplug/pnv_php.c
+++ b/drivers/pci/hotplug/pnv_php.c

@@ -220,12 +220,16 @@ static int pnv_php_populate_changeset(struct of_changeset *ocs,
 
 	for_each_child_of_node(dn, child) {
 		ret = of_changeset_attach_node(ocs, child);
-		if (ret)
+		if (ret) {
+			of_node_put(child);
 			break;
+		}
 
 		ret = pnv_php_populate_changeset(ocs, child);
-		if (ret)
+		if (ret) {
+			of_node_put(child);
 			break;
+		}
 	}
 
 	return ret;

On Wed, May 23, 2018 at 09:07:15PM +0200, Julia Lawall wrote:

The device node iterators perform an of_node_get on each iteration, so a
jump out of the loop requires an of_node_put.

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

// <smpl>
@@
expression root,e;
local idexpression child;
iterator name for_each_child_of_node;
@@

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

Signed-off-by: Julia Lawall <redacted>

Applied to pci/hotplug for v4.18, thanks!