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| author | Aaron Ma <aaron.ma@canonical.com> | 2020-10-02 20:09:16 +0300 |
|---|---|---|
| committer | Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2020-10-05 12:20:42 +0300 |
| commit | 720ef73d1a239e33c3ad8fac356b9b1348e68aaf (patch) | |
| tree | 483c869ff06cfeed8ecd40b450f0ee87f481b407 | |
| parent | 9fb77799557d1537a059161bf645db7be9e358ae (diff) | |
| download | linux-720ef73d1a239e33c3ad8fac356b9b1348e68aaf.tar.xz | |
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: 46445b6b896fd ("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>
| -rw-r--r-- | drivers/platform/x86/thinkpad_acpi.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c index 7cb3b71c67fe..e5a62fa9a879 100644 --- a/drivers/platform/x86/thinkpad_acpi.c +++ b/drivers/platform/x86/thinkpad_acpi.c @@ -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)) { |