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

commit 720ef73d1a 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: 46445b6b89 ("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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
5.4-rM2-2.2.x-imx-squashed
Aaron Ma 2020-10-03 01:09:16 +08:00 committed by Greg Kroah-Hartman
parent da4cdc87df
commit 3fd2647f9d
1 changed files with 3 additions and 1 deletions
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4
drivers/platform/x86/thinkpad_acpi.c
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@ -6863,8 +6863,10 @@ 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)) {