diff options
Diffstat (limited to 'drivers/xen/grant-dma-ops.c')
| -rw-r--r-- | drivers/xen/grant-dma-ops.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/drivers/xen/grant-dma-ops.c b/drivers/xen/grant-dma-ops.c index 860f37c93af4..3089940436be 100644 --- a/drivers/xen/grant-dma-ops.c +++ b/drivers/xen/grant-dma-ops.c @@ -168,7 +168,9 @@ static dma_addr_t xen_grant_dma_map_page(struct device *dev, struct page *page, unsigned long attrs) { struct xen_grant_dma_data *data; - unsigned int i, n_pages = PFN_UP(offset + size); + unsigned long dma_offset = offset_in_page(offset), + pfn_offset = PFN_DOWN(offset); + unsigned int i, n_pages = PFN_UP(dma_offset + size); grant_ref_t grant; dma_addr_t dma_handle; @@ -187,10 +189,11 @@ static dma_addr_t xen_grant_dma_map_page(struct device *dev, struct page *page, for (i = 0; i < n_pages; i++) { gnttab_grant_foreign_access_ref(grant + i, data->backend_domid, - xen_page_to_gfn(page) + i, dir == DMA_TO_DEVICE); + pfn_to_gfn(page_to_xen_pfn(page) + i + pfn_offset), + dir == DMA_TO_DEVICE); } - dma_handle = grant_to_dma(grant) + offset; + dma_handle = grant_to_dma(grant) + dma_offset; return dma_handle; } |