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acpi: Conditionally set mapping_offset in IORT

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The spec recommends to set the mapping_offset only when there are
ID mappings as indicated by the mapping_count field.

Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
This commit is contained in:
Patrick Rudolph 2025-03-16 09:32:55 +01:00 committed by Tom Rini
parent fe8844f4ad
commit 9c74857640
1 changed files with 6 additions and 2 deletions
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8
lib/acpi/acpi_table.c
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@ -649,7 +649,9 @@ int acpi_iort_add_rc(struct acpi_ctx *ctx,
node->type = ACPI_IORT_NODE_PCI_ROOT_COMPLEX;
node->revision = 2;
node->mapping_count = num_mappings;
node->mapping_offset = sizeof(struct acpi_iort_node) + sizeof(struct acpi_iort_rc);
if (num_mappings)
node->mapping_offset = sizeof(struct acpi_iort_node) +
sizeof(struct acpi_iort_rc);
node->length = sizeof(struct acpi_iort_node);
node->length += sizeof(struct acpi_iort_rc);
@ -709,7 +711,9 @@ int acpi_iort_add_smmu_v3(struct acpi_ctx *ctx,
node->type = ACPI_IORT_NODE_SMMU_V3;
node->revision = 5;
node->mapping_count = num_mappings;
node->mapping_offset = sizeof(struct acpi_iort_node) + sizeof(struct acpi_iort_smmu_v3);
if (num_mappings)
node->mapping_offset = sizeof(struct acpi_iort_node) +
sizeof(struct acpi_iort_smmu_v3);
node->length = sizeof(struct acpi_iort_node);
node->length += sizeof(struct acpi_iort_smmu_v3);