PMCG node can have zero ID mapping if its overflow interrupt is wire based. The code to parse PMCG node can not assume it will have a single ID mapping.
Signed-off-by: Tuan Phan <[email protected]> --- drivers/acpi/arm64/iort.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c index ed3d2d1..72444e1 100644 --- a/drivers/acpi/arm64/iort.c +++ b/drivers/acpi/arm64/iort.c @@ -441,7 +441,9 @@ static int iort_get_id_mapping_index(struct acpi_iort_node *node) return smmu->id_mapping_index; case ACPI_IORT_NODE_PMCG: - return 0; + if (node->mapping_count) + return 0; + return -EINVAL; default: return -EINVAL; } -- 2.7.4
