iommu/fsl_pamu: merge handle_attach_device into fsl_pamu_attach_device

No good reason to split this functionality over two functions.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Will Deacon <will@kernel.org>
Acked-by: Li Yang <leoyang.li@nxp.com>
Link: https://lore.kernel.org/r/20210401155256.298656-10-hch@lst.de
Signed-off-by: Joerg Roedel <jroedel@suse.de>

drivers/iommu/fsl_pamu_domain.c

@@ -240,45 +240,13 @@ static int update_domain_stash(struct fsl_dma_domain *dma_domain, u32 val)
 	return ret;
 }
 
-/*
- * Attach the LIODN to the DMA domain and configure the geometry
- * and window mappings.
- */
-static int handle_attach_device(struct fsl_dma_domain *dma_domain,
-				struct device *dev, const u32 *liodn,
-				int num)
-{
-	unsigned long flags;
-	int ret = 0;
-	int i;
-
-	spin_lock_irqsave(&dma_domain->domain_lock, flags);
-	for (i = 0; i < num; i++) {
-		/* Ensure that LIODN value is valid */
-		if (liodn[i] >= PAACE_NUMBER_ENTRIES) {
-			pr_debug("Invalid liodn %d, attach device failed for %pOF\n",
-				 liodn[i], dev->of_node);
-			ret = -EINVAL;
-			break;
-		}
-
-		attach_device(dma_domain, liodn[i], dev);
-		ret = pamu_set_liodn(dma_domain, dev, liodn[i]);
-		if (ret)
-			break;
-	}
-	spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
-
-	return ret;
-}
-
 static int fsl_pamu_attach_device(struct iommu_domain *domain,
 				  struct device *dev)
 {
 	struct fsl_dma_domain *dma_domain = to_fsl_dma_domain(domain);
+	unsigned long flags;
+	int len, ret = 0, i;
 	const u32 *liodn;
-	u32 liodn_cnt;
-	int len, ret = 0;
 	struct pci_dev *pdev = NULL;
 	struct pci_controller *pci_ctl;
 
@@ -298,14 +266,27 @@ static int fsl_pamu_attach_device(struct iommu_domain *domain,
 	}
 
 	liodn = of_get_property(dev->of_node, "fsl,liodn", &len);
-	if (liodn) {
-		liodn_cnt = len / sizeof(u32);
-		ret = handle_attach_device(dma_domain, dev, liodn, liodn_cnt);
-	} else {
+	if (!liodn) {
 		pr_debug("missing fsl,liodn property at %pOF\n", dev->of_node);
-		ret = -EINVAL;
+		return -EINVAL;
 	}
 
+	spin_lock_irqsave(&dma_domain->domain_lock, flags);
+	for (i = 0; i < len / sizeof(u32); i++) {
+		/* Ensure that LIODN value is valid */
+		if (liodn[i] >= PAACE_NUMBER_ENTRIES) {
+			pr_debug("Invalid liodn %d, attach device failed for %pOF\n",
+				 liodn[i], dev->of_node);
+			ret = -EINVAL;
+			break;
+		}
+
+		attach_device(dma_domain, liodn[i], dev);
+		ret = pamu_set_liodn(dma_domain, dev, liodn[i]);
+		if (ret)
+			break;
+	}
+	spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
 	return ret;
 }