diff options
| -rw-r--r-- | drivers/xen/grant-dma-ops.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/xen/grant-dma-ops.c b/drivers/xen/grant-dma-ops.c index 8973fc1e9ccc..1998d0e8ce82 100644 --- a/drivers/xen/grant-dma-ops.c +++ b/drivers/xen/grant-dma-ops.c @@ -153,7 +153,7 @@ 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(size); + unsigned int i, n_pages = PFN_UP(offset + size); grant_ref_t grant; dma_addr_t dma_handle; @@ -185,7 +185,8 @@ static void xen_grant_dma_unmap_page(struct device *dev, dma_addr_t dma_handle, unsigned long attrs) { struct xen_grant_dma_data *data; - unsigned int i, n_pages = PFN_UP(size); + unsigned long offset = dma_handle & (PAGE_SIZE - 1); + unsigned int i, n_pages = PFN_UP(offset + size); grant_ref_t grant; if (WARN_ON(dir == DMA_NONE)) |