linux-kernel - [PATCH] amba: tegra-ahb: fix device leak on smmu enable

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Message-ID: <20250925150007.24173-1-johan@kernel.org>
Date: Thu, 25 Sep 2025 17:00:07 +0200
From: Johan Hovold <johan@...nel.org>
To: Russell King <linux@...linux.org.uk>,
	Thierry Reding <thierry.reding@...il.com>,
	Jonathan Hunter <jonathanh@...dia.com>
Cc: linux-tegra@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Johan Hovold <johan@...nel.org>,
	stable@...r.kernel.org
Subject: [PATCH] amba: tegra-ahb: fix device leak on smmu enable

Make sure to drop the reference taken to the ahb platform device when
looking up its driver data while enabling the smmu.

Note that holding a reference to a device does not prevent its driver
data from going away.

Fixes: 89c788bab1f0 ("ARM: tegra: Add SMMU enabler in AHB")
Cc: stable@...r.kernel.org	# 3.5
Signed-off-by: Johan Hovold <johan@...nel.org>
---
 drivers/amba/tegra-ahb.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/amba/tegra-ahb.c b/drivers/amba/tegra-ahb.c
index c0e8b765522d..f23c3ed01810 100644
--- a/drivers/amba/tegra-ahb.c
+++ b/drivers/amba/tegra-ahb.c
@@ -144,6 +144,7 @@ int tegra_ahb_enable_smmu(struct device_node *dn)
 	if (!dev)
 		return -EPROBE_DEFER;
 	ahb = dev_get_drvdata(dev);
+	put_device(dev);
 	val = gizmo_readl(ahb, AHB_ARBITRATION_XBAR_CTRL);
 	val |= AHB_ARBITRATION_XBAR_CTRL_SMMU_INIT_DONE;
 	gizmo_writel(ahb, val, AHB_ARBITRATION_XBAR_CTRL);
-- 
2.49.1