wifi: ath11k: Use iommu_paging_domain_alloc()

An iommu domain is allocated in ath11k_ahb_fw_resources_init() and is
attached to ab_ahb->fw.dev in the same function.

Use iommu_paging_domain_alloc() to make it explicit.

Signed-off-by: Lu Baolu <[email protected]>
Acked-by: Jeff Johnson <[email protected]>
Reviewed-by: Jason Gunthorpe <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Will Deacon <[email protected]>

Author: LuBaolu

drivers/net/wireless/ath/ath11k/ahb.c

@@ -1001,10 +1001,10 @@ static int ath11k_ahb_fw_resources_init(struct ath11k_base *ab)
 
 	ab_ahb->fw.dev = &pdev->dev;
 
-	iommu_dom = iommu_domain_alloc(&platform_bus_type);
-	if (!iommu_dom) {
+	iommu_dom = iommu_paging_domain_alloc(ab_ahb->fw.dev);
+	if (IS_ERR(iommu_dom)) {
 		ath11k_err(ab, "failed to allocate iommu domain\n");
-		ret = -ENOMEM;
+		ret = PTR_ERR(iommu_dom);
 		goto err_unregister;
 	}