linux-kernel - [PATCH] clk: tegra: tegra124-emc: fix device leak on set

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Message-ID: <20251121164003.13047-1-johan@kernel.org>
Date: Fri, 21 Nov 2025 17:40:03 +0100
From: Johan Hovold <johan@...nel.org>
To: Peter De Schrijver <pdeschrijver@...dia.com>,
	Prashant Gaikwad <pgaikwad@...dia.com>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...nel.org>
Cc: Thierry Reding <thierry.reding@...il.com>,
	Mikko Perttunen <mperttunen@...dia.com>,
	Miaoqian Lin <linmq006@...il.com>,
	linux-clk@...r.kernel.org,
	linux-tegra@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Johan Hovold <johan@...nel.org>,
	stable@...r.kernel.org
Subject: [PATCH] clk: tegra: tegra124-emc: fix device leak on set_rate()

Make sure to drop the reference taken when looking up the EMC device and
its driver data on first set_rate().

Note that holding a reference to a device does not prevent its driver
data from going away so there is no point in keeping the reference.

Fixes: 2db04f16b589 ("clk: tegra: Add EMC clock driver")
Fixes: 6d6ef58c2470 ("clk: tegra: tegra124-emc: Fix missing put_device() call in emc_ensure_emc_driver")
Cc: stable@...r.kernel.org	# 4.2: 6d6ef58c2470
Cc: Mikko Perttunen <mperttunen@...dia.com>
Cc: Miaoqian Lin <linmq006@...il.com>
Signed-off-by: Johan Hovold <johan@...nel.org>
---
 drivers/clk/tegra/clk-tegra124-emc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clk/tegra/clk-tegra124-emc.c b/drivers/clk/tegra/clk-tegra124-emc.c
index 2a6db0434281..2777e70da8b9 100644
--- a/drivers/clk/tegra/clk-tegra124-emc.c
+++ b/drivers/clk/tegra/clk-tegra124-emc.c
@@ -197,8 +197,8 @@ static struct tegra_emc *emc_ensure_emc_driver(struct tegra_clk_emc *tegra)
 	tegra->emc_node = NULL;
 
 	tegra->emc = platform_get_drvdata(pdev);
+	put_device(&pdev->dev);
 	if (!tegra->emc) {
-		put_device(&pdev->dev);
 		pr_err("%s: cannot find EMC driver\n", __func__);
 		return NULL;
 	}
-- 
2.51.2