linux-kernel - [POC][PATCH 25/83] dma_4u_alloc_coherent(): don't mix virtual and physical addresses

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Message-Id: <1450741676-5865-25-git-send-email-viro@ZenIV.linux.org.uk>
Date:	Mon, 21 Dec 2015 23:46:58 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	linux-kernel@...r.kernel.org
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [POC][PATCH 25/83] dma_4u_alloc_coherent(): don't mix virtual and physical addresses

From: Al Viro <viro@...iv.linux.org.uk>

Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
---
 arch/sparc/kernel/iommu.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/arch/sparc/kernel/iommu.c b/arch/sparc/kernel/iommu.c
index eae7b6b..18a40c6 100644
--- a/arch/sparc/kernel/iommu.c
+++ b/arch/sparc/kernel/iommu.c
@@ -215,23 +215,22 @@ static void *dma_4u_alloc_coherent(struct device *dev, size_t size,
 	if (unlikely(!page))
 		return NULL;
 
-	first_page = (unsigned long) page_address(page);
-	memset((char *)first_page, 0, PAGE_SIZE << order);
+	ret =  page_address(page);
+	memset(ret, 0, PAGE_SIZE << order);
 
 	iommu = dev->archdata.iommu;
 
 	iopte = alloc_npages(dev, iommu, size >> IO_PAGE_SHIFT);
 
 	if (unlikely(iopte == NULL)) {
-		free_pages((void *)first_page, order);
+		free_pages(ret, order);
 		return NULL;
 	}
 
 	*dma_addrp = (iommu->tbl.table_map_base +
 		      ((iopte - iommu->page_table) << IO_PAGE_SHIFT));
-	ret = (void *) first_page;
 	npages = size >> IO_PAGE_SHIFT;
-	first_page = __pa(first_page);
+	first_page = __pa(ret);
 	while (npages--) {
 		iopte_val(*iopte) = (IOPTE_CONSISTENT(0UL) |
 				     IOPTE_WRITE |
-- 
2.1.4

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