Input: twl6040-vibra - fix DT node memory management

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 <hns@goldelico.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/input/misc/twl6040-vibra.c b/drivers/input/misc/twl6040-vibra.c
index 6d26eecc278c7e63d4e251ebbdbe3d03fdcf7de1..9ab85a2551c46848d32db381a96a8ee65c6c9087 100644 (file)
--- a/drivers/input/misc/twl6040-vibra.c
+++ b/drivers/input/misc/twl6040-vibra.c
@@ -264,6 +264,7 @@ static int twl6040_vibra_probe(struct platform_device *pdev)
        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,
                                                 "vibra");
        if (!twl6040_core_node) {