[PATCH 4.9 129/141] soc/tegra: pmc: Fix child-node lookup

[Greg Kroah-Hartman]

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Johan Hovold <johan@xxxxxxxxxx>

commit 1dc6bd5e39a29453bdcc17348dd2a89f1aa4004e 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 pmc node could end up being prematurely
freed as of_find_node_by_name() drops a reference to its first argument.

Fixes: 3568df3d31d6 ("soc: tegra: Add thermal reset (thermtrip) support to PMC")
Cc: stable <stable@xxxxxxxxxxxxxxx>     # 4.0
Cc: Mikko Perttunen <mperttunen@xxxxxxxxxx>
Signed-off-by: Johan Hovold <johan@xxxxxxxxxx>
Reviewed-by: Mikko Perttunen <mperttunen@xxxxxxxxxx>
Signed-off-by: Thierry Reding <treding@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/soc/tegra/pmc.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/soc/tegra/pmc.c
+++ b/drivers/soc/tegra/pmc.c
@@ -1189,7 +1189,7 @@ static void tegra_pmc_init_tsense_reset(
 	if (!pmc->soc->has_tsense_reset)
 		return;
 
-	np = of_find_node_by_name(pmc->dev->of_node, "i2c-thermtrip");
+	np = of_get_child_by_name(pmc->dev->of_node, "i2c-thermtrip");
 	if (!np) {
 		dev_warn(dev, "i2c-thermtrip node not found, %s.\n", disabled);
 		return;