ACPI driver should make sure all the processor IDs in their ACPI Namespace
are unique. the driver performs a depth-first walk of the namespace tree
and calls the acpi_processor_ids_walk() to check the duplicate IDs.
But, the acpi_processor_ids_walk() mistakes the return value. If a
processor is checked, it returns true which causes the walk break
immediately, and other processors will never be checked.
Repace the value with AE_OK which is the standard acpi_status value.
And don't abort the namespace walk even on error.
Fixes 8c8cb30f49b8 ("acpi/processor: Implement DEVICE operator for processor enumeration")
Signed-off-by: Dou Liyang <douly.fnst@xxxxxxxxxxxxxx>
---
Changelog:
The duplicate IDs may only be found in Ivb42 machine, and we added a check at linux-4.9.
But, we introduced a bug in linux-4.12 by commit 8c8cb30f49b8.
For resolving the bug, firstly, I want to remove the check[1]. because, Linux will check
duplicate IDs when it hot-adds a physical CPU and only one of the processors with duplicate
IDs will be used.
But, I am not sure if All the processors with the some IDs will never be used ?
With this patch, All the processors with the some IDs will never be hot-plugged.
v1 --> v2:
- Fix the check against duplicate IDs suggested by Rafael.
[1] https://lkml.org/lkml/2018/5/28/213
---
drivers/acpi/acpi_processor.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/drivers/acpi/acpi_processor.c b/drivers/acpi/acpi_processor.c
index 449d86d39965..d90f669a395b 100644
--- a/drivers/acpi/acpi_processor.c
+++ b/drivers/acpi/acpi_processor.c
@@ -643,7 +643,7 @@ static acpi_status __init acpi_processor_ids_walk(acpi_handle handle,
status = acpi_get_type(handle, &acpi_type);
if (ACPI_FAILURE(status))
- return false;
+ return AE_OK;
switch (acpi_type) {
case ACPI_TYPE_PROCESSOR:
@@ -663,11 +663,12 @@ static acpi_status __init acpi_processor_ids_walk(acpi_handle handle,
}
processor_validated_ids_update(uid);
- return true;
+ return AE_OK;
err:
+ /* Exit on error, but don't abort the namespace walk */
acpi_handle_info(handle, "Invalid processor object\n");
- return false;
+ return AE_OK;
}
--
2.14.3
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