linux-kernel - [PATCH 2/3] phy: ti: omap-usb2: fix device leak at unbind

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Message-ID: <20250724131206.2211-3-johan@kernel.org>
Date: Thu, 24 Jul 2025 15:12:05 +0200
From: Johan Hovold <johan@...nel.org>
To: Vinod Koul <vkoul@...nel.org>
Cc: JC Kuo <jckuo@...dia.com>,
	Kishon Vijay Abraham I <kishon@...nel.org>,
	Thierry Reding <thierry.reding@...il.com>,
	Jonathan Hunter <jonathanh@...dia.com>,
	linux-phy@...ts.infradead.org,
	linux-tegra@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Johan Hovold <johan@...nel.org>,
	stable@...r.kernel.org,
	Roger Quadros <rogerq@...nel.org>
Subject: [PATCH 2/3] phy: ti: omap-usb2: fix device leak at unbind

Make sure to drop the reference to the control device taken by
of_find_device_by_node() during probe when the driver is unbound.

Fixes: 478b6c7436c2 ("usb: phy: omap-usb2: Don't use omap_get_control_dev()")
Cc: stable@...r.kernel.org	# 3.13
Cc: Roger Quadros <rogerq@...nel.org>
Signed-off-by: Johan Hovold <johan@...nel.org>
---
 drivers/phy/ti/phy-omap-usb2.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/phy/ti/phy-omap-usb2.c b/drivers/phy/ti/phy-omap-usb2.c
index c1a0ef979142..c444bb2530ca 100644
--- a/drivers/phy/ti/phy-omap-usb2.c
+++ b/drivers/phy/ti/phy-omap-usb2.c
@@ -363,6 +363,13 @@ static void omap_usb2_init_errata(struct omap_usb *phy)
 		phy->flags |= OMAP_USB2_DISABLE_CHRG_DET;
 }
 
+static void omap_usb2_put_device(void *_dev)
+{
+	struct device *dev = _dev;
+
+	put_device(dev);
+}
+
 static int omap_usb2_probe(struct platform_device *pdev)
 {
 	struct omap_usb	*phy;
@@ -373,6 +380,7 @@ static int omap_usb2_probe(struct platform_device *pdev)
 	struct device_node *control_node;
 	struct platform_device *control_pdev;
 	const struct usb_phy_data *phy_data;
+	int ret;
 
 	phy_data = device_get_match_data(&pdev->dev);
 	if (!phy_data)
@@ -423,6 +431,11 @@ static int omap_usb2_probe(struct platform_device *pdev)
 			return -EINVAL;
 		}
 		phy->control_dev = &control_pdev->dev;
+
+		ret = devm_add_action_or_reset(&pdev->dev, omap_usb2_put_device,
+					       phy->control_dev);
+		if (ret)
+			return ret;
 	} else {
 		if (of_property_read_u32_index(node,
 					       "syscon-phy-power", 1,
-- 
2.49.1