iommu: rockchip: Free domain on .domain_free

IOMMU domain resource life is well-defined, managed
by .domain_alloc and .domain_free.

Therefore, domain-specific resources shouldn't be tied to
the device life, but instead to its domain.
Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Acked-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

drivers/iommu/rockchip-iommu.c

@@ -979,13 +979,13 @@ static struct iommu_domain *rk_iommu_domain_alloc(unsigned type)
 	if (!dma_dev)
 		return NULL;
 
-	rk_domain = devm_kzalloc(dma_dev, sizeof(*rk_domain), GFP_KERNEL);
+	rk_domain = kzalloc(sizeof(*rk_domain), GFP_KERNEL);
 	if (!rk_domain)
 		return NULL;
 
 	if (type == IOMMU_DOMAIN_DMA &&
 	    iommu_get_dma_cookie(&rk_domain->domain))
-		return NULL;
+		goto err_free_domain;
 
 	/*
 	 * rk32xx iommus use a 2 level pagetable.
@@ -1020,6 +1020,8 @@ static struct iommu_domain *rk_iommu_domain_alloc(unsigned type)
 err_put_cookie:
 	if (type == IOMMU_DOMAIN_DMA)
 		iommu_put_dma_cookie(&rk_domain->domain);
+err_free_domain:
+	kfree(rk_domain);
 
 	return NULL;
 }
@@ -1048,6 +1050,7 @@ static void rk_iommu_domain_free(struct iommu_domain *domain)
 
 	if (domain->type == IOMMU_DOMAIN_DMA)
 		iommu_put_dma_cookie(&rk_domain->domain);
+	kfree(rk_domain);
 }
 
 static int rk_iommu_add_device(struct device *dev)