linux-kernel - [PATCH v2 1/4] gpio: virtuser: fix missing lookup table cleanups

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Message-ID: <20250103030402.81954-2-koichiro.den@canonical.com>
Date: Fri,  3 Jan 2025 12:03:59 +0900
From: Koichiro Den <koichiro.den@...onical.com>
To: linux-gpio@...r.kernel.org
Cc: linus.walleij@...aro.org,
	brgl@...ev.pl,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 1/4] gpio: virtuser: fix missing lookup table cleanups

When a virtuser device is created via configfs and the probe fails due
to an incorrect lookup table, the table is not removed. This prevents
subsequent probe attempts from succeeding, even if the issue is
corrected, unless the device is released. Additionally, cleanup is also
needed in the less likely case of platform_device_register_full()
failure.

Ensure the lookup table is removed whenever the device activation fails.

Fixes: 91581c4b3f29 ("gpio: virtuser: new virtual testing driver for the GPIO API")
Signed-off-by: Koichiro Den <koichiro.den@...onical.com>
---
 drivers/gpio/gpio-virtuser.c | 25 ++++++++++++++++---------
 1 file changed, 16 insertions(+), 9 deletions(-)

diff --git a/drivers/gpio/gpio-virtuser.c b/drivers/gpio/gpio-virtuser.c
index 91b6352c957c..ec5abfebca3d 100644
--- a/drivers/gpio/gpio-virtuser.c
+++ b/drivers/gpio/gpio-virtuser.c
@@ -1487,10 +1487,8 @@ gpio_virtuser_device_activate(struct gpio_virtuser_device *dev)
 	pdevinfo.fwnode = swnode;
 
 	ret = gpio_virtuser_make_lookup_table(dev);
-	if (ret) {
-		fwnode_remove_software_node(swnode);
-		return ret;
-	}
+	if (ret)
+		goto err_remove_swnode;
 
 	reinit_completion(&dev->probe_completion);
 	dev->driver_bound = false;
@@ -1498,23 +1496,32 @@ gpio_virtuser_device_activate(struct gpio_virtuser_device *dev)
 
 	pdev = platform_device_register_full(&pdevinfo);
 	if (IS_ERR(pdev)) {
+		ret = PTR_ERR(pdev);
 		bus_unregister_notifier(&platform_bus_type, &dev->bus_notifier);
-		fwnode_remove_software_node(swnode);
-		return PTR_ERR(pdev);
+		goto err_remove_lookup_table;
 	}
 
 	wait_for_completion(&dev->probe_completion);
 	bus_unregister_notifier(&platform_bus_type, &dev->bus_notifier);
 
 	if (!dev->driver_bound) {
-		platform_device_unregister(pdev);
-		fwnode_remove_software_node(swnode);
-		return -ENXIO;
+		ret = -ENXIO;
+		goto err_unregister_pdev;
 	}
 
 	dev->pdev = pdev;
 
 	return 0;
+
+err_unregister_pdev:
+	platform_device_unregister(pdev);
+err_remove_lookup_table:
+	gpiod_remove_lookup_table(dev->lookup_table);
+	kfree(dev->lookup_table);
+err_remove_swnode:
+	fwnode_remove_software_node(swnode);
+
+	return ret;
 }
 
 static void
-- 
2.43.0