Return error when inserting a new IOMMU which doesn't support PI
if PI is currently in use.
Signed-off-by: Feng Wu <feng...@intel.com>
---
drivers/iommu/intel_irq_remapping.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/iommu/intel_irq_remapping.c
b/drivers/iommu/intel_irq_remapping.c
index 554e203..4fb3576 100644
--- a/drivers/iommu/intel_irq_remapping.c
+++ b/drivers/iommu/intel_irq_remapping.c
@@ -1360,6 +1360,9 @@ int dmar_ir_hotplug(struct dmar_drhd_unit *dmaru, bool
insert)
return -EINVAL;
if (!ecap_ir_support(iommu->ecap))
return 0;
+ if (irq_remapping_cap(IRQ_POSTING_CAP) &&
+ !cap_pi_support(iommu->cap))
+ return -EBUSY;
if (insert) {
if (!iommu->ir_table)
--
2.1.0
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