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authorAaron Ma <aaron.ma@canonical.com>2020-10-03 01:09:16 +0800
committerAndy Shevchenko <andriy.shevchenko@linux.intel.com>2020-10-05 12:20:42 +0300
commit720ef73d1a239e33c3ad8fac356b9b1348e68aaf (patch)
tree483c869ff06cfeed8ecd40b450f0ee87f481b407 /drivers/platform
parent9fb77799557d1537a059161bf645db7be9e358ae (diff)
downloadlinux-720ef73d1a239e33c3ad8fac356b9b1348e68aaf.tar.bz2
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>
Diffstat (limited to 'drivers/platform')
-rw-r--r--drivers/platform/x86/thinkpad_acpi.c4
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)) {