Your patch fixes my issue, so feel free to add a
Tested-by: Nicolai Stange <nicstange@xxxxxxxxx>
for this either.
But please see my remark below.
Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx> writes:
> When enumerating I2C devices connected to an I2C adapter we scan the whole
> namespace (as it is possible to have devices anywhere in that namespace,
> not just below the I2C adapter device) and add each found device to the I2C
> bus in question.
>
> Now after commit 525e6fabeae2 ("i2c / ACPI: add support for ACPI
> reconfigure notifications") checking of the adapter handle to the one found
> in the I2cSerialBus() resource was moved to happen after resources of the
> I2C device has been parsed. This means that if the I2cSerialBus() resource
> points to an adapter that does not exists in the system we still parse
> those resources. This is problematic in particular because
> acpi_dev_resource_interrupt() tries to configure GSI if the device also has
> an Interrupt() resource. Failing to do that results errrors like this to be
> printed on the console:
>
> [ 10.409490] ERROR: Unable to locate IOAPIC for GSI 37
>
> To fix this we pass the I2C adapter to i2c_acpi_get_info() and make sure
> the handle matches the one in the I2cSerialBus() resource before doing
> anything else to the device.
>
> Reported-by: Nicolai Stange <nicstange@xxxxxxxxx>
> Signed-off-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
> ---
> drivers/i2c/i2c-core.c | 12 +++++++-----
> 1 file changed, 7 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
> index c61c961cf8f9..eb32cb783fc8 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;
> @@ -182,6 +183,10 @@ static int i2c_acpi_get_info(struct acpi_device *adev,
> if (ret)
> return ret;
>
> + /* The adapter must match the one in I2cSerialBus() connector */
> + if (adapter && ACPI_HANDLE(&adapter->dev) != lookup.adapter_handle)
> + return -ENODEV;
> +
Would it be sensible to add the adapter presence check you provided
earlier, i.e.
+ else if (!adapter) {
+ /* 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;
+
+ }
here, because we can't know if ...
> info->fwnode = acpi_fwnode_handle(adev);
> *adapter_handle = lookup.adapter_handle;
>
> @@ -231,10 +236,7 @@ static acpi_status i2c_acpi_add_device(acpi_handle handle, u32 level,
> 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, &adapter_handle))
> return AE_OK;
>
> i2c_acpi_register_device(adapter, adev, &info);
> @@ -368,7 +370,7 @@ 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;
... the ACPI device added here is physically existent?
>
> adapter = i2c_acpi_find_adapter_by_handle(adapter_handle);
I suppose that it is always true that adev has been LoadTable()'d from
some SSDT? Can't this SSDT be just as broken as my DSDT is? Not that
I've seen such a case in the real world, I'm just asking.
Thanks,
Nicolai
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