Hi Souptick,
On 2018-11-15 16:50, Souptick Joarder wrote:
> Convert to use vm_insert_range to map range of kernel memory
> to user vma.
>
> Signed-off-by: Souptick Joarder <jrdr.linux@xxxxxxxxx>
> Reviewed-by: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Acked-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
> ---
> drivers/media/common/videobuf2/videobuf2-dma-sg.c | 23 +++++++----------------
> 1 file changed, 7 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/media/common/videobuf2/videobuf2-dma-sg.c b/drivers/media/common/videobuf2/videobuf2-dma-sg.c
> index 015e737..898adef 100644
> --- a/drivers/media/common/videobuf2/videobuf2-dma-sg.c
> +++ b/drivers/media/common/videobuf2/videobuf2-dma-sg.c
> @@ -328,28 +328,19 @@ static unsigned int vb2_dma_sg_num_users(void *buf_priv)
> static int vb2_dma_sg_mmap(void *buf_priv, struct vm_area_struct *vma)
> {
> struct vb2_dma_sg_buf *buf = buf_priv;
> - unsigned long uaddr = vma->vm_start;
> - unsigned long usize = vma->vm_end - vma->vm_start;
> - int i = 0;
> + unsigned long page_count = vma_pages(vma);
> + int err;
>
> if (!buf) {
> printk(KERN_ERR "No memory to map\n");
> return -EINVAL;
> }
>
> - do {
> - int ret;
> -
> - ret = vm_insert_page(vma, uaddr, buf->pages[i++]);
> - if (ret) {
> - printk(KERN_ERR "Remapping memory, error: %d\n", ret);
> - return ret;
> - }
> -
> - uaddr += PAGE_SIZE;
> - usize -= PAGE_SIZE;
> - } while (usize > 0);
> -
> + err = vm_insert_range(vma, vma->vm_start, buf->pages, page_count);
> + if (err) {
> + printk(KERN_ERR "Remapping memory, error: %d\n", err);
> + return err;
> + }
>
> /*
> * Use common vm_area operations to track buffer refcount.
Best regards
--
Marek Szyprowski, PhD
Samsung R&D Institute Poland
