diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index 94263ed2c564..0832998eca38 100644
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -87,7 +87,6 @@ struct iommu_dma_cookie {
 	struct iommu_domain		*fq_domain;
 	/* Options for dma-iommu use */
 	struct iommu_dma_options	options;
-	struct mutex			mutex;
 };
 
 static DEFINE_STATIC_KEY_FALSE(iommu_deferred_attach_enabled);
@@ -401,7 +400,6 @@ int iommu_get_dma_cookie(struct iommu_domain *domain)
 	if (!domain->iova_cookie)
 		return -ENOMEM;
 
-	mutex_init(&domain->iova_cookie->mutex);
 	iommu_domain_set_sw_msi(domain, iommu_dma_sw_msi);
 	return 0;
 }
@@ -709,23 +707,20 @@ static int iommu_dma_init_domain(struct iommu_domain *domain, struct device *dev
 			 domain->geometry.aperture_start >> order);
 
 	/* start_pfn is always nonzero for an already-initialised domain */
-	mutex_lock(&cookie->mutex);
 	if (iovad->start_pfn) {
 		if (1UL << order != iovad->granule ||
 		    base_pfn != iovad->start_pfn) {
 			pr_warn("Incompatible range for DMA domain\n");
-			ret = -EFAULT;
-			goto done_unlock;
+			return -EFAULT;
 		}
 
-		ret = 0;
-		goto done_unlock;
+		return 0;
 	}
 
 	init_iova_domain(iovad, 1UL << order, base_pfn);
 	ret = iova_domain_init_rcaches(iovad);
 	if (ret)
-		goto done_unlock;
+		return ret;
 
 	iommu_dma_init_options(&cookie->options, dev);
 
@@ -734,11 +729,7 @@ static int iommu_dma_init_domain(struct iommu_domain *domain, struct device *dev
 	    (!device_iommu_capable(dev, IOMMU_CAP_DEFERRED_FLUSH) || iommu_dma_init_fq(domain)))
 		domain->type = IOMMU_DOMAIN_DMA;
 
-	ret = iova_reserve_iommu_regions(dev, domain);
-
-done_unlock:
-	mutex_unlock(&cookie->mutex);
-	return ret;
+	return iova_reserve_iommu_regions(dev, domain);
 }
 
 /**