linux-kernel - [PATCH] iio: light: cm32181: Unregister second I2C client if present

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Date:   Mon,  6 Feb 2023 14:36:16 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     ktsai@...ellamicro.com, jic23@...nel.org, lars@...afoo.de
Cc:     hdegoede@...hat.com, Kai-Heng Feng <kai.heng.feng@...onical.com>,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] iio: light: cm32181: Unregister second I2C client if present

If a second client that talks to the actual I2C address was created in
probe(), there should be a corresponding cleanup in remove() to avoid
leakage.

So if the "client" is not the same one used by I2C core, unregister it
accordingly.

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2152281
Fixes: c1e62062ff54 ("iio: light: cm32181: Handle CM3218 ACPI devices with 2 I2C resources")
Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
---
 drivers/iio/light/cm32181.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/iio/light/cm32181.c b/drivers/iio/light/cm32181.c
index b1674a5bfa368..37439e103d273 100644
--- a/drivers/iio/light/cm32181.c
+++ b/drivers/iio/light/cm32181.c
@@ -488,6 +488,15 @@ static int cm32181_probe(struct i2c_client *client)
 	return 0;
 }
 
+static void cm32181_remove(struct i2c_client *client)
+{
+	struct cm32181_chip *cm32181 = iio_priv(i2c_get_clientdata(client));
+
+	/* Unregister the dummy client */
+	if (cm32181->client != client)
+		i2c_unregister_device(cm32181->client);
+}
+
 static int cm32181_suspend(struct device *dev)
 {
 	struct cm32181_chip *cm32181 = iio_priv(dev_get_drvdata(dev));
@@ -531,6 +540,7 @@ static struct i2c_driver cm32181_driver = {
 		.pm = pm_sleep_ptr(&cm32181_pm_ops),
 	},
 	.probe_new	= cm32181_probe,
+	.remove		= cm32181_remove,
 };
 
 module_i2c_driver(cm32181_driver);
-- 
2.34.1