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| author | Christoph Hellwig <hch@lst.de> | 2019-04-11 10:20:00 +0300 |
|---|---|---|
| committer | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2019-05-03 02:52:06 +0300 |
| commit | 063b8271ec8f706d833e61dfca40c512504a62c1 (patch) | |
| tree | b1ae9fd85840c7c1a5bf4514e984ea6ebb2574dd /drivers/xen/swiotlb-xen.c | |
| parent | 2e12dceef3d3fb8d796e384aa242062d1643cad4 (diff) | |
| download | linux-063b8271ec8f706d833e61dfca40c512504a62c1.tar.xz | |
swiotlb-xen: ensure we have a single callsite for xen_dma_map_page
Refactor the code a bit to make further changes easier.
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'drivers/xen/swiotlb-xen.c')
| -rw-r--r-- | drivers/xen/swiotlb-xen.c | 31 |
1 files changed, 16 insertions, 15 deletions
diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c index ba558094d0e6..64cb94dfedd4 100644 --- a/drivers/xen/swiotlb-xen.c +++ b/drivers/xen/swiotlb-xen.c @@ -388,13 +388,8 @@ static dma_addr_t xen_swiotlb_map_page(struct device *dev, struct page *page, if (dma_capable(dev, dev_addr, size) && !range_straddles_page_boundary(phys, size) && !xen_arch_need_swiotlb(dev, phys, dev_addr) && - (swiotlb_force != SWIOTLB_FORCE)) { - /* we are not interested in the dma_addr returned by - * xen_dma_map_page, only in the potential cache flushes executed - * by the function. */ - xen_dma_map_page(dev, page, dev_addr, offset, size, dir, attrs); - return dev_addr; - } + swiotlb_force != SWIOTLB_FORCE) + goto done; /* * Oh well, have to allocate and map a bounce buffer. @@ -407,19 +402,25 @@ static dma_addr_t xen_swiotlb_map_page(struct device *dev, struct page *page, return DMA_MAPPING_ERROR; dev_addr = xen_phys_to_bus(map); - xen_dma_map_page(dev, pfn_to_page(map >> PAGE_SHIFT), - dev_addr, map & ~PAGE_MASK, size, dir, attrs); /* * Ensure that the address returned is DMA'ble */ - if (dma_capable(dev, dev_addr, size)) - return dev_addr; - - attrs |= DMA_ATTR_SKIP_CPU_SYNC; - swiotlb_tbl_unmap_single(dev, map, size, dir, attrs); + if (unlikely(!dma_capable(dev, dev_addr, size))) { + swiotlb_tbl_unmap_single(dev, map, size, dir, + attrs | DMA_ATTR_SKIP_CPU_SYNC); + return DMA_MAPPING_ERROR; + } - return DMA_MAPPING_ERROR; + page = pfn_to_page(map >> PAGE_SHIFT); + offset = map & ~PAGE_MASK; +done: + /* + * we are not interested in the dma_addr returned by xen_dma_map_page, + * only in the potential cache flushes executed by the function. + */ + xen_dma_map_page(dev, page, dev_addr, offset, size, dir, attrs); + return dev_addr; } /* |