[PATCH v4 7/9] videobuf2/videobuf2-dma-sg.c: Convert to use vm_insert_range

Souptick Joarder
2018-12-17T20:21:42Z

Convert to use vm_insert_range to map range of kernel memory
to user vma.

Signed-off-by: Souptick Joarder <jrdr.linux@gmail.com>
Reviewed-by: Matthew Wilcox <willy@infradead.org>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
Acked-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
---
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.
--
1.9.1