Commit 8058d699 authored by Hans de Goede's avatar Hans de Goede Committed by Wolfram Sang
Browse files

i2c: core: Restore acpi_walk_dep_device_list() getting called after registering the ACPI i2c devs

Commit 21653a41 ("i2c: core: Call i2c_acpi_install_space_handler()
before i2c_acpi_register_devices()")'s intention was to only move the
acpi_install_address_space_handler() call to the point before where
the ACPI declared i2c-children of the adapter where instantiated by

But i2c_acpi_install_space_handler() had a call to
acpi_walk_dep_device_list() hidden (that is I missed it) at the end
of it, so as an unwanted side-effect now acpi_walk_dep_device_list()
was also being called before i2c_acpi_register_devices().

Move the acpi_walk_dep_device_list() call to the end of
i2c_acpi_register_devices(), so that it is once again called *after*
the i2c_client-s hanging of the adapter have been created.

This fixes the Microsoft Surface Go 2 hanging at boot.

Fixes: 21653a41 ("i2c: core: Call i2c_acpi_install_space_handler() before i2c_acpi_register_devices()")

Reported-by: default avatarRainer Finke <>
Reported-by: default avatarKieran Bingham <>
Suggested-by: default avatarMaximilian Luz <>
Tested-by: default avatarKieran Bingham <>
Signed-off-by: default avatarHans de Goede <>
Signed-off-by: default avatarWolfram Sang <>
parent d7691390
......@@ -264,6 +264,7 @@ static acpi_status i2c_acpi_add_device(acpi_handle handle, u32 level,
void i2c_acpi_register_devices(struct i2c_adapter *adap)
acpi_status status;
acpi_handle handle;
if (!has_acpi_companion(&adap->dev))
......@@ -274,6 +275,15 @@ void i2c_acpi_register_devices(struct i2c_adapter *adap)
adap, NULL);
if (ACPI_FAILURE(status))
dev_warn(&adap->dev, "failed to enumerate I2C slaves\n");
if (!adap->dev.parent)
handle = ACPI_HANDLE(adap->dev.parent);
if (!handle)
static const struct acpi_device_id i2c_acpi_force_400khz_device_ids[] = {
......@@ -719,7 +729,6 @@ int i2c_acpi_install_space_handler(struct i2c_adapter *adapter)
return -ENOMEM;
return 0;
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