From: Rafael J. Wysocki rafael.j.wysocki@intel.com
[ Upstream commit 1cdfe9e346b4c5509ffe19ccde880fd259d9f7a3 ]
ACPICA commit c11af67d8f7e3d381068ce7771322f2b5324d687
If original_count is 0 in acpi_ut_update_ref_count (), acpi_ut_delete_internal_obj () is invoked for the target object, which is incorrect, because that object has been deleted once already and the memory allocated to store it may have been reclaimed and allocated for a different purpose by the host OS. Moreover, a confusing debug message following the "Reference Count is already zero, cannot decrement" warning is printed in that case.
To fix this issue, make acpi_ut_update_ref_count () return after finding that original_count is 0 and printing the above warning.
Link: https://github.com/acpica/acpica/commit/c11af67d Link: https://github.com/acpica/acpica/pull/652 Reported-by: Mark Asselstine mark.asselstine@windriver.com Signed-off-by: Rafael J. Wysocki rafael.j.wysocki@intel.com Signed-off-by: Bob Moore robert.moore@intel.com Signed-off-by: Rafael J. Wysocki rafael.j.wysocki@intel.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/acpi/acpica/utdelete.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/acpi/acpica/utdelete.c b/drivers/acpi/acpica/utdelete.c index 61a979d0fbc5a..64a90ba71f18c 100644 --- a/drivers/acpi/acpica/utdelete.c +++ b/drivers/acpi/acpica/utdelete.c @@ -442,6 +442,7 @@ acpi_ut_update_ref_count(union acpi_operand_object *object, u32 action) ACPI_WARNING((AE_INFO, "Obj %p, Reference Count is already zero, cannot decrement\n", object)); + return; }
ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,