[PATCH] 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 noflush
 queue if it fails.

Signed-off-by: Tom Murphy <murphyt7@xxxxxx>
---
 drivers/iommu/dma-iommu.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index 4959f5df21bd..5f69126f3e91 100644
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -343,8 +343,11 @@ 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, NULL);
+		if (init_iova_flush_queue(iovad, iommu_dma_flush_iotlb_all,
+					NULL))
+			pr_warn("iova flush queue initialization failed\n");
+		else
+			cookie->fq_domain = domain;
 	}
 
 	if (!dev)
-- 
2.20.1