[Patch Part3 V6 6/8] iommu/vt-d: Enhance error recovery in function intel_enable_irq_remapping()

[Jiang Liu <jiang.liu-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>]

Enhance error recovery in function intel_enable_irq_remapping()
by tearing down all created data structures.

Signed-off-by: Jiang Liu <jiang.liu-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
Reviewed-by: Yijing Wang <wangyijing-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
---
 drivers/iommu/intel_irq_remapping.c |    8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/iommu/intel_irq_remapping.c b/drivers/iommu/intel_irq_remapping.c
index 1edbbed8c6bc..ddf98a8782a2 100644
--- a/drivers/iommu/intel_irq_remapping.c
+++ b/drivers/iommu/intel_irq_remapping.c
@@ -701,9 +701,11 @@ static int __init intel_enable_irq_remapping(void)
 	return eim ? IRQ_REMAP_X2APIC_MODE : IRQ_REMAP_XAPIC_MODE;
 
 error:
-	/*
-	 * handle error condition gracefully here!
-	 */
+	for_each_iommu(iommu, drhd)
+		if (ecap_ir_support(iommu->ecap)) {
+			iommu_disable_irq_remapping(iommu);
+			intel_teardown_irq_remapping(iommu);
+		}
 
 	if (x2apic_present)
 		pr_warn("Failed to enable irq remapping.  You are vulnerable to irq-injection attacks.\n");
-- 
1.7.10.4