From: Johan Hovold <johan@kernel.org>
Date: Wed, 15 Nov 2017 09:44:58 +0000 (+0100)
Subject: soc/tegra: pmc: Fix child-node lookup
X-Git-Tag: v5.15~7691^2~12^2~6
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=1dc6bd5e39a29453bdcc17348dd2a89f1aa4004e;p=platform%2Fkernel%2Flinux-starfive.git

soc/tegra: pmc: Fix child-node lookup

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>
---

diff --git a/drivers/soc/tegra/pmc.c b/drivers/soc/tegra/pmc.c
index 2d6f3fc..ed71a4c 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;