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Groups > linux.kernel > #1255204

[PATCH 7/9] gpu: host1x: add missing of_node_put

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for_each_child_of_node performs an of_node_get on each iteration, so
a break out of the loop requires an of_node_put.

A simplified version of the semantic patch that fixes this problem is as
follows (http://coccinelle.lip6.fr):

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

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

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

---
 drivers/gpu/host1x/bus.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/host1x/bus.c b/drivers/gpu/host1x/bus.c
index 4a99c64..c1795a2 100644
--- a/drivers/gpu/host1x/bus.c
+++ b/drivers/gpu/host1x/bus.c
@@ -82,8 +82,10 @@ static int host1x_device_parse_dt(struct host1x_device *device,
 		if (of_match_node(driver->subdevs, np) &&
 		    of_device_is_available(np)) {
 			err = host1x_subdev_add(device, np);
-			if (err < 0)
+			if (err < 0) {
+				of_node_put(np);
 				return err;
+			}
 		}
 	}
 

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[PATCH 0/9] add missing of_node_put Julia Lawall <Julia.Lawall@lip6.fr> - 2015-10-24 17:00 +0200
  [PATCH 4/9] leds: 88pm860x: add missing of_node_put Julia Lawall <Julia.Lawall@lip6.fr> - 2015-10-24 17:00 +0200
  [PATCH 2/9] leds: bcm6358: add missing of_node_put Julia Lawall <Julia.Lawall@lip6.fr> - 2015-10-24 17:00 +0200
  [PATCH 3/9] leds: bcm6328: add missing of_node_put Julia Lawall <Julia.Lawall@lip6.fr> - 2015-10-24 17:00 +0200
  [PATCH 7/9] gpu: host1x: add missing of_node_put Julia Lawall <Julia.Lawall@lip6.fr> - 2015-10-24 17:00 +0200
  [PATCH 8/9] soc: ti: knav_qmss_queue: add missing of_node_put Julia Lawall <Julia.Lawall@lip6.fr> - 2015-10-24 17:00 +0200
  Re: [PATCH 0/9] add missing of_node_put Jacek Anaszewski <j.anaszewski@samsung.com> - 2015-10-26 09:50 +0100

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