4.9-stable review patch. If anyone has any objections, please let me know.
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From: Johan Hovold johan@kernel.org
commit 85e9b13cbb130a3209f21bd7933933399c389ffe upstream.
Fix child-node lookup during probe, which ended up searching the whole device tree depth-first starting at the parent rather than just matching on its children.
To make things worse, the parent node was prematurely freed, while the child node was leaked.
Note that the CONFIG_OF compile guard can be removed as of_get_child_by_name() provides a !CONFIG_OF implementation which always fails.
Fixes: 37e13cecaa14 ("mfd: Add support for Device Tree to twl6040") Fixes: ca2cad6ae38e ("mfd: Fix twl6040 build failure") Signed-off-by: Johan Hovold johan@kernel.org Acked-by: Peter Ujfalusi peter.ujfalusi@ti.com Signed-off-by: Lee Jones lee.jones@linaro.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/mfd/twl6040.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-)
--- a/drivers/mfd/twl6040.c +++ b/drivers/mfd/twl6040.c @@ -97,12 +97,16 @@ static struct reg_sequence twl6040_patch };
-static bool twl6040_has_vibra(struct device_node *node) +static bool twl6040_has_vibra(struct device_node *parent) { -#ifdef CONFIG_OF - if (of_find_node_by_name(node, "vibra")) + struct device_node *node; + + node = of_get_child_by_name(parent, "vibra"); + if (node) { + of_node_put(node); return true; -#endif + } + return false; }