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Subject[PATCH 4.4 35/53] Input: twl6040-vibra - fix DT node memory management
4.4-stable review patch.  If anyone has any objections, please let me know.


From: H. Nikolaus Schaller <>

commit c52c545ead97fcc2f4f8ea38f1ae3c23211e09a8 upstream.

commit e7ec014a47e4 ("Input: twl6040-vibra - update for device tree support")

made the separate vibra DT node to a subnode of the twl6040.

It now calls of_find_node_by_name() to locate the "vibra" subnode.
This function has a side effect to call of_node_put on() for the twl6040
parent node passed in as a parameter. This causes trouble later on.

Solution: we must call of_node_get() before of_find_node_by_name()

Signed-off-by: H. Nikolaus Schaller <>
Signed-off-by: Dmitry Torokhov <>
Signed-off-by: Greg Kroah-Hartman <>

drivers/input/misc/twl6040-vibra.c | 1 +
1 file changed, 1 insertion(+)

--- a/drivers/input/misc/twl6040-vibra.c
+++ b/drivers/input/misc/twl6040-vibra.c
@@ -262,6 +262,7 @@ static int twl6040_vibra_probe(struct pl
int vddvibr_uV = 0;
int error;

+ of_node_get(twl6040_core_dev->of_node);
twl6040_core_node = of_find_node_by_name(twl6040_core_dev->of_node,
if (!twl6040_core_node) {

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