[PATCH 2/2] Handle init_iova_flush_queue failure in dma-iommu path

[Tom Murphy]

init_iova_flush_queue can fail if we run out of memory. Fall back to no
flush queue if it fails.

Signed-off-by: Tom Murphy <murphyt7 at tcd.ie>
---
 drivers/iommu/dma-iommu.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index 7433f74d921a..5445e2be08b5 100644
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -356,9 +356,11 @@ static int iommu_dma_init_domain(struct iommu_domain *domain, dma_addr_t base,
 
 	if (!cookie->fq_domain && !iommu_domain_get_attr(domain,
 			DOMAIN_ATTR_DMA_USE_FLUSH_QUEUE, &attr) && attr) {
-		cookie->fq_domain = domain;
-		init_iova_flush_queue(iovad, iommu_dma_flush_iotlb_all,
-				iommu_dma_entry_dtor);
+		if (init_iova_flush_queue(iovad, iommu_dma_flush_iotlb_all,
+				iommu_dma_entry_dtor))
+			pr_warn("iova flush queue initialization failed\n");
+		else
+			cookie->fq_domain = domain;
 	}
 
 	if (!dev)
-- 
2.20.1