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-rw-r--r--drivers/i2c/i2c-core.c27
1 files changed, 20 insertions, 7 deletions
diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index 65242666901e..cdbbd9bdb7b4 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -168,6 +168,7 @@ static int i2c_acpi_do_lookup(struct acpi_device *adev,
static int i2c_acpi_get_info(struct acpi_device *adev,
struct i2c_board_info *info,
+ struct i2c_adapter *adapter,
acpi_handle *adapter_handle)
{
struct list_head resource_list;
@@ -182,8 +183,24 @@ static int i2c_acpi_get_info(struct acpi_device *adev,
if (ret)
return ret;
+ if (adapter) {
+ /* The adapter must match the one in I2cSerialBus() connector */
+ if (ACPI_HANDLE(&adapter->dev) != lookup.adapter_handle)
+ return -ENODEV;
+ } else {
+ struct acpi_device *adapter_adev;
+
+ /* The adapter must be present */
+ if (acpi_bus_get_device(lookup.adapter_handle, &adapter_adev))
+ return -ENODEV;
+ if (acpi_bus_get_status(adapter_adev) ||
+ !adapter_adev->status.present)
+ return -ENODEV;
+ }
+
info->fwnode = acpi_fwnode_handle(adev);
- *adapter_handle = lookup.adapter_handle;
+ if (adapter_handle)
+ *adapter_handle = lookup.adapter_handle;
/* Then fill IRQ number if any */
INIT_LIST_HEAD(&resource_list);
@@ -225,16 +242,12 @@ static acpi_status i2c_acpi_add_device(acpi_handle handle, u32 level,
{
struct i2c_adapter *adapter = data;
struct acpi_device *adev;
- acpi_handle adapter_handle;
struct i2c_board_info info;
if (acpi_bus_get_device(handle, &adev))
return AE_OK;
- if (i2c_acpi_get_info(adev, &info, &adapter_handle))
- return AE_OK;
-
- if (adapter_handle != ACPI_HANDLE(&adapter->dev))
+ if (i2c_acpi_get_info(adev, &info, adapter, NULL))
return AE_OK;
i2c_acpi_register_device(adapter, adev, &info);
@@ -368,7 +381,7 @@ static int i2c_acpi_notify(struct notifier_block *nb, unsigned long value,
switch (value) {
case ACPI_RECONFIG_DEVICE_ADD:
- if (i2c_acpi_get_info(adev, &info, &adapter_handle))
+ if (i2c_acpi_get_info(adev, &info, NULL, &adapter_handle))
break;
adapter = i2c_acpi_find_adapter_by_handle(adapter_handle);