linux-kernel - [PATCH 21/23] xen-swiotlb: remove the mapping_error dma_map

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Message-Id: <20181130132231.16512-22-hch@lst.de>
Date:   Fri, 30 Nov 2018 14:22:29 +0100
From:   Christoph Hellwig <hch@....de>
To:     iommu@...ts.linux-foundation.org
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Jon Mason <jdmason@...zu.us>, Joerg Roedel <joro@...tes.org>,
        David Woodhouse <dwmw2@...radead.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>, x86@...nel.org,
        linux-alpha@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-ia64@...r.kernel.org, linux-parisc@...r.kernel.org,
        xen-devel@...ts.xenproject.org, linux-arch@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 21/23] xen-swiotlb: remove the mapping_error dma_map_ops method

Return DMA_MAPPING_ERROR instead of 0 on a dma mapping failure and let
the core dma-mapping code handle the rest.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 drivers/xen/swiotlb-xen.c | 12 ++----------
 1 file changed, 2 insertions(+), 10 deletions(-)

diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c
index 2a7f545bd0b5..6dc969d5ea2f 100644
--- a/drivers/xen/swiotlb-xen.c
+++ b/drivers/xen/swiotlb-xen.c
@@ -53,8 +53,6 @@
  * API.
  */
 
-#define XEN_SWIOTLB_ERROR_CODE	(~(dma_addr_t)0x0)
-
 static char *xen_io_tlb_start, *xen_io_tlb_end;
 static unsigned long xen_io_tlb_nslabs;
 /*
@@ -406,7 +404,7 @@ static dma_addr_t xen_swiotlb_map_page(struct device *dev, struct page *page,
 	map = swiotlb_tbl_map_single(dev, start_dma_addr, phys, size, dir,
 				     attrs);
 	if (map == SWIOTLB_MAP_ERROR)
-		return XEN_SWIOTLB_ERROR_CODE;
+		return DMA_MAPPING_ERROR;
 
 	dev_addr = xen_phys_to_bus(map);
 	xen_dma_map_page(dev, pfn_to_page(map >> PAGE_SHIFT),
@@ -421,7 +419,7 @@ static dma_addr_t xen_swiotlb_map_page(struct device *dev, struct page *page,
 	attrs |= DMA_ATTR_SKIP_CPU_SYNC;
 	swiotlb_tbl_unmap_single(dev, map, size, dir, attrs);
 
-	return XEN_SWIOTLB_ERROR_CODE;
+	return DMA_MAPPING_ERROR;
 }
 
 /*
@@ -700,11 +698,6 @@ xen_swiotlb_get_sgtable(struct device *dev, struct sg_table *sgt,
 	return dma_common_get_sgtable(dev, sgt, cpu_addr, handle, size, attrs);
 }
 
-static int xen_swiotlb_mapping_error(struct device *dev, dma_addr_t dma_addr)
-{
-	return dma_addr == XEN_SWIOTLB_ERROR_CODE;
-}
-
 const struct dma_map_ops xen_swiotlb_dma_ops = {
 	.alloc = xen_swiotlb_alloc_coherent,
 	.free = xen_swiotlb_free_coherent,
@@ -719,5 +712,4 @@ const struct dma_map_ops xen_swiotlb_dma_ops = {
 	.dma_supported = xen_swiotlb_dma_supported,
 	.mmap = xen_swiotlb_dma_mmap,
 	.get_sgtable = xen_swiotlb_get_sgtable,
-	.mapping_error	= xen_swiotlb_mapping_error,
 };
-- 
2.19.1