[PATCH 5.4 20/85] platform/x86: thinkpad_acpi: re-initialize ACPI buffer size when reuse

From: Greg Kroah-Hartman
Date: Mon Oct 12 2020 - 09:58:29 EST


From: Aaron Ma <aaron.ma@xxxxxxxxxxxxx>

commit 720ef73d1a239e33c3ad8fac356b9b1348e68aaf upstream.

Evaluating ACPI _BCL could fail, then ACPI buffer size will be set to 0.
When reuse this ACPI buffer, AE_BUFFER_OVERFLOW will be triggered.

Re-initialize buffer size will make ACPI evaluate successfully.

Fixes: 46445b6b896fd ("thinkpad-acpi: fix handle locate for video and query of _BCL")
Signed-off-by: Aaron Ma <aaron.ma@xxxxxxxxxxxxx>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
drivers/platform/x86/thinkpad_acpi.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/platform/x86/thinkpad_acpi.c
+++ b/drivers/platform/x86/thinkpad_acpi.c
@@ -6863,8 +6863,10 @@ static int __init tpacpi_query_bcl_level
list_for_each_entry(child, &device->children, node) {
acpi_status status = acpi_evaluate_object(child->handle, "_BCL",
NULL, &buffer);
- if (ACPI_FAILURE(status))
+ if (ACPI_FAILURE(status)) {
+ buffer.length = ACPI_ALLOCATE_BUFFER;
continue;
+ }

obj = (union acpi_object *)buffer.pointer;
if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {