[PATCH v4 11/13] dma-direct: rename ret to cpu_addr in alloc helpers

["Aneesh Kumar K.V (Arm)" <aneesh.kumar@kernel.org>]

ret in dma_direct_alloc() and dma_direct_alloc_pages() holds the returned
CPU mapping, not a generic return value. Rename it to cpu_addr and update
the remaining uses to match.

This makes the allocation paths easier to follow and keeps the local naming
consistent with what the variable actually represents.

Signed-off-by: Aneesh Kumar K.V (Arm) <aneesh.kumar@kernel.org>
---
 kernel/dma/direct.c | 31 +++++++++++++++----------------
 1 file changed, 15 insertions(+), 16 deletions(-)

diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c
index 1e9f9ff7b9d3..902008e40ea1 100644
--- a/kernel/dma/direct.c
+++ b/kernel/dma/direct.c
@@ -212,7 +212,7 @@ void *dma_direct_alloc(struct device *dev, size_t size,
 	bool mark_mem_decrypt = false;
 	bool allow_highmem = true;
 	struct page *page;
-	void *ret;
+	void *cpu_addr;
 
 	/*
 	 * DMA_ATTR_CC_SHARED is not a caller-visible dma_alloc_*()
@@ -326,34 +326,33 @@ void *dma_direct_alloc(struct device *dev, size_t size,
 		arch_dma_prep_coherent(page, size);
 
 		/* create a coherent mapping */
-		ret = dma_common_contiguous_remap(page, size, prot,
-				__builtin_return_address(0));
-		if (!ret)
+		cpu_addr = dma_common_contiguous_remap(page, size, prot,
+					__builtin_return_address(0));
+		if (!cpu_addr)
 			goto out_encrypt_pages;
 	} else {
-		ret = page_address(page);
+		cpu_addr = page_address(page);
 	}
 
-	memset(ret, 0, size);
+	memset(cpu_addr, 0, size);
 
 	if (set_uncached) {
 		void *uncached_cpu_addr;
 
 		arch_dma_prep_coherent(page, size);
-		uncached_cpu_addr = arch_dma_set_uncached(ret, size);
+		uncached_cpu_addr = arch_dma_set_uncached(cpu_addr, size);
 		if (IS_ERR(uncached_cpu_addr))
 			goto out_free_remap_pages;
-		ret = uncached_cpu_addr;
+		cpu_addr = uncached_cpu_addr;
 	}
 
 	*dma_handle = phys_to_dma_direct(dev, page_to_phys(page),
 					 !!(attrs & DMA_ATTR_CC_SHARED));
-	return ret;
-
+	return cpu_addr;
 
 out_free_remap_pages:
 	if (remap)
-		dma_common_free_remap(ret, size);
+		dma_common_free_remap(cpu_addr, size);
 
 out_encrypt_pages:
 	if (mark_mem_decrypt &&
@@ -437,7 +436,7 @@ struct page *dma_direct_alloc_pages(struct device *dev, size_t size,
 {
 	unsigned long attrs = 0;
 	struct page *page;
-	void *ret;
+	void *cpu_addr;
 
 	if (force_dma_unencrypted(dev))
 		attrs |= DMA_ATTR_CC_SHARED;
@@ -455,7 +454,7 @@ struct page *dma_direct_alloc_pages(struct device *dev, size_t size,
 			swiotlb_free(dev, page, size);
 			return NULL;
 		}
-		ret = page_address(page);
+		cpu_addr = page_address(page);
 		goto setup_page;
 	}
 
@@ -463,11 +462,11 @@ struct page *dma_direct_alloc_pages(struct device *dev, size_t size,
 	if (!page)
 		return NULL;
 
-	ret = page_address(page);
-	if ((attrs & DMA_ATTR_CC_SHARED) && dma_set_decrypted(dev, ret, size))
+	cpu_addr = page_address(page);
+	if ((attrs & DMA_ATTR_CC_SHARED) && dma_set_decrypted(dev, cpu_addr, size))
 		goto out_leak_pages;
 setup_page:
-	memset(ret, 0, size);
+	memset(cpu_addr, 0, size);
 	*dma_handle = phys_to_dma_direct(dev, page_to_phys(page),
 					 !!(attrs & DMA_ATTR_CC_SHARED));
 	return page;
-- 
2.43.0