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-rw-r--r--drivers/iommu/dmar.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c
index a7967ceb79e6..785675a56a10 100644
--- a/drivers/iommu/dmar.c
+++ b/drivers/iommu/dmar.c
@@ -309,6 +309,7 @@ parse_dmar_table(void)
struct acpi_table_dmar *dmar;
struct acpi_dmar_header *entry_header;
int ret = 0;
+ int drhd_count = 0;
/*
* Do it again, earlier dmar_tbl mapping could be mapped with
@@ -347,6 +348,7 @@ parse_dmar_table(void)
switch (entry_header->type) {
case ACPI_DMAR_TYPE_HARDWARE_UNIT:
+ drhd_count++;
ret = dmar_parse_one_drhd(entry_header);
break;
case ACPI_DMAR_TYPE_RESERVED_MEMORY:
@@ -371,6 +373,8 @@ parse_dmar_table(void)
entry_header = ((void *)entry_header + entry_header->length);
}
+ if (drhd_count == 0)
+ pr_warn(FW_BUG "No DRHD structure found in DMAR table\n");
return ret;
}