This is a note to let you know that I've just added the patch titled i2c: acpi: fix resource leak in reconfiguration device addition to the 5.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: i2c-acpi-fix-resource-leak-in-reconfiguration-device.patch and it can be found in the queue-5.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit a8f872f0eff3194ed73f01a66387b8bddc53e918 Author: Jamie Iles <quic_jiles@xxxxxxxxxxx> Date: Wed Sep 22 17:57:18 2021 +0100 i2c: acpi: fix resource leak in reconfiguration device addition [ Upstream commit 6558b646ce1c2a872fe1c2c7cb116f05a2c1950f ] acpi_i2c_find_adapter_by_handle() calls bus_find_device() which takes a reference on the adapter which is never released which will result in a reference count leak and render the adapter unremovable. Make sure to put the adapter after creating the client in the same manner that we do for OF. Fixes: 525e6fabeae2 ("i2c / ACPI: add support for ACPI reconfigure notifications") Signed-off-by: Jamie Iles <quic_jiles@xxxxxxxxxxx> Acked-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx> [wsa: fixed title] Signed-off-by: Wolfram Sang <wsa@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/i2c/i2c-core-acpi.c b/drivers/i2c/i2c-core-acpi.c index c70983780ae7..fe466ee4c49b 100644 --- a/drivers/i2c/i2c-core-acpi.c +++ b/drivers/i2c/i2c-core-acpi.c @@ -436,6 +436,7 @@ static int i2c_acpi_notify(struct notifier_block *nb, unsigned long value, break; i2c_acpi_register_device(adapter, adev, &info); + put_device(&adapter->dev); break; case ACPI_RECONFIG_DEVICE_REMOVE: if (!acpi_device_enumerated(adev))