[PATCH v8 20/23] 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.

Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Tested-by: Michael Kelley <mhklinux@outlook.com>
Tested-by: Mostafa Saleh <smostafa@google.com>
Reviewed-by: Petr Tesarik <ptesarik@suse.com>
Signed-off-by: Aneesh Kumar K.V (Arm) <aneesh.kumar@kernel.org>
---
 kernel/dma/direct.c | 40 ++++++++++++++++++++--------------------
 1 file changed, 20 insertions(+), 20 deletions(-)

diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c
index eb0ce0787885..50a8335f3830 100644
--- a/kernel/dma/direct.c
+++ b/kernel/dma/direct.c
@@ -206,7 +206,7 @@ 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;
 
 	if (force_dma_unencrypted(dev))
 		attrs |= __DMA_ATTR_ALLOC_CC_SHARED;
@@ -266,9 +266,10 @@ void *dma_direct_alloc(struct device *dev, size_t size,
 	 */
 	if ((remap || (attrs & __DMA_ATTR_ALLOC_CC_SHARED)) &&
 	    dma_direct_use_pool(dev, gfp)) {
-		page = dma_direct_alloc_from_pool(dev, size, dma_handle,
-						  &ret, gfp, attrs);
-		return page ? ret : NULL;
+		page = dma_direct_alloc_from_pool(dev, size,
+					dma_handle, &cpu_addr,
+					gfp, attrs);
+		return page ? cpu_addr : NULL;
 	}
 
 	if (is_swiotlb_for_alloc(dev)) {
@@ -315,34 +316,33 @@ 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_ALLOC_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 &&
@@ -434,21 +434,21 @@ 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_ALLOC_CC_SHARED;
 
 	if ((attrs & __DMA_ATTR_ALLOC_CC_SHARED) && dma_direct_use_pool(dev, gfp))
 		return dma_direct_alloc_from_pool(dev, size, dma_handle,
-						  &ret, gfp, attrs);
+						  &cpu_addr, gfp, attrs);
 
 	if (is_swiotlb_for_alloc(dev)) {
 		page = dma_direct_alloc_swiotlb(dev, size, attrs);
 		if (!page)
 			return NULL;
 
-		ret = page_address(page);
+		cpu_addr = page_address(page);
 		goto setup_page;
 	}
 
@@ -456,12 +456,12 @@ struct page *dma_direct_alloc_pages(struct device *dev, size_t size,
 	if (!page)
 		return NULL;
 
-	ret = page_address(page);
+	cpu_addr = page_address(page);
 	if ((attrs & __DMA_ATTR_ALLOC_CC_SHARED) &&
-	    dma_set_decrypted(dev, ret, size))
+	    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_ALLOC_CC_SHARED);
 	return page;
-- 
2.43.0