diff options
Diffstat (limited to 'drivers/media/video/videobuf-dma-sg.c')
| -rw-r--r-- | drivers/media/video/videobuf-dma-sg.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/drivers/media/video/videobuf-dma-sg.c b/drivers/media/video/videobuf-dma-sg.c index 06f9a9c..2ad0bc2 100644 --- a/drivers/media/video/videobuf-dma-sg.c +++ b/drivers/media/video/videobuf-dma-sg.c @@ -94,7 +94,7 @@ err: * must free the memory. */ static struct scatterlist *videobuf_pages_to_sg(struct page **pages, - int nr_pages, int offset) + int nr_pages, int offset, size_t size) { struct scatterlist *sglist; int i; @@ -110,12 +110,14 @@ static struct scatterlist *videobuf_pages_to_sg(struct page **pages, /* DMA to highmem pages might not work */ goto highmem; sg_set_page(&sglist[0], pages[0], PAGE_SIZE - offset, offset); + size -= PAGE_SIZE - offset; for (i = 1; i < nr_pages; i++) { if (NULL == pages[i]) goto nopage; if (PageHighMem(pages[i])) goto highmem; - sg_set_page(&sglist[i], pages[i], PAGE_SIZE, 0); + sg_set_page(&sglist[i], pages[i], min(PAGE_SIZE, size), 0); + size -= min(PAGE_SIZE, size); } return sglist; @@ -170,7 +172,8 @@ static int videobuf_dma_init_user_locked(struct videobuf_dmabuf *dma, first = (data & PAGE_MASK) >> PAGE_SHIFT; last = ((data+size-1) & PAGE_MASK) >> PAGE_SHIFT; - dma->offset = data & ~PAGE_MASK; + dma->offset = data & ~PAGE_MASK; + dma->size = size; dma->nr_pages = last-first+1; dma->pages = kmalloc(dma->nr_pages * sizeof(struct page *), GFP_KERNEL); if (NULL == dma->pages) @@ -252,7 +255,7 @@ int videobuf_dma_map(struct device *dev, struct videobuf_dmabuf *dma) if (dma->pages) { dma->sglist = videobuf_pages_to_sg(dma->pages, dma->nr_pages, - dma->offset); + dma->offset, dma->size); } if (dma->vaddr) { dma->sglist = videobuf_vmalloc_to_sg(dma->vaddr, |