Commit 720ef73d authored Oct 03, 2020 by Aaron Ma Committed by Andy Shevchenko Oct 05, 2020

platform/x86: thinkpad_acpi: re-initialize ACPI buffer size when reuse

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: 46445b6b ("thinkpad-acpi: fix handle locate for video and query of _BCL")
Signed-off-by: Aaron Ma <aaron.ma@canonical.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

parent 9fb77799

drivers/platform/x86/thinkpad_acpi.c

+3 −1

Original line number	Diff line number	Diff line
		@@ -6829,8 +6829,10 @@ static int __init tpacpi_query_bcl_levels(acpi_handle handle)
		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)) {

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