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.
Fixes: 24e516049360 ("ACPI/IORT: Add support for PMCG")
Reviewed-by: Hanjun Guo <[email protected]>
Signed-off-by: Tuan Phan <[email protected]>
---
v1 -> v2:
- Use pmcg node to detect wired base overflow interrupt.
v2 -> v3:
- Address Hanjun and Robin's comments.
drivers/acpi/arm64/iort.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
index ed3d2d1..12bb70e 100644
--- a/drivers/acpi/arm64/iort.c
+++ b/drivers/acpi/arm64/iort.c
@@ -414,6 +414,7 @@ static struct acpi_iort_node *iort_node_get_id(struct
acpi_iort_node *node,
static int iort_get_id_mapping_index(struct acpi_iort_node *node)
{
struct acpi_iort_smmu_v3 *smmu;
+ struct acpi_iort_pmcg *pmcg;
switch (node->type) {
case ACPI_IORT_NODE_SMMU_V3:
@@ -441,6 +442,10 @@ static int iort_get_id_mapping_index(struct acpi_iort_node
*node)
return smmu->id_mapping_index;
case ACPI_IORT_NODE_PMCG:
+ pmcg = (struct acpi_iort_pmcg *)node->node_data;
+ if (pmcg->overflow_gsiv || node->mapping_count == 0)
+ return -EINVAL;
+
return 0;
default:
return -EINVAL;
--
2.7.4
