From 1dc6bd5e39a29453bdcc17348dd2a89f1aa4004e Mon Sep 17 00:00:00 2001
From: Johan Hovold <johan@kernel.org>
Date: Wed, 15 Nov 2017 10:44:58 +0100
Subject: [PATCH] soc/tegra: pmc: Fix child-node lookup
Git-commit: 1dc6bd5e39a29453bdcc17348dd2a89f1aa4004e
Patch-mainline: v4.20-rc1
References: bsc#1051510

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@vger.kernel.org>     # 4.0
Cc: Mikko Perttunen <mperttunen@nvidia.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Reviewed-by: Mikko Perttunen <mperttunen@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Acked-by: Takashi Iwai <tiwai@suse.de>

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

diff --git a/drivers/soc/tegra/pmc.c b/drivers/soc/tegra/pmc.c
index 2d6f3fcf3211..ed71a4c9c8b2 100644
--- a/drivers/soc/tegra/pmc.c
+++ b/drivers/soc/tegra/pmc.c
@@ -1288,7 +1288,7 @@ static void tegra_pmc_init_tsense_reset(struct tegra_pmc *pmc)
 	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;
-- 
2.19.1