linux-kernel - [PATCH] soc/tegra: pmc: fix child-node lookup

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Date:   Wed, 15 Nov 2017 10:44:58 +0100
From:   Johan Hovold <johan@...nel.org>
To:     Thierry Reding <thierry.reding@...il.com>
Cc:     Jonathan Hunter <jonathanh@...dia.com>,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
        Johan Hovold <johan@...nel.org>,
        stable <stable@...r.kernel.org>,
        Mikko Perttunen <mperttunen@...dia.com>
Subject: [PATCH] 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@...r.kernel.org>     # 4.0
Cc: Mikko Perttunen <mperttunen@...dia.com>
Signed-off-by: Johan Hovold <johan@...nel.org>
---
 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 0453ff6839a7..7e9ef3431bea 100644
--- a/drivers/soc/tegra/pmc.c
+++ b/drivers/soc/tegra/pmc.c
@@ -1321,7 +1321,7 @@ 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;
-- 
2.15.0