Signed-off-by: Jan Kara <jack@xxxxxxx>
---
drivers/media/v4l2-core/videobuf2-dma-sg.c | 85 ++++++------------------------
1 file changed, 15 insertions(+), 70 deletions(-)
diff --git a/drivers/media/v4l2-core/videobuf2-dma-sg.c b/drivers/media/v4l2-core/videobuf2-dma-sg.c
index ef0b3f765d8e..a37ee0fa84d3 100644
--- a/drivers/media/v4l2-core/videobuf2-dma-sg.c
+++ b/drivers/media/v4l2-core/videobuf2-dma-sg.c
@@ -33,6 +33,7 @@ module_param(debug, int, 0644);
struct vb2_dma_sg_buf {
void *vaddr;
struct page **pages;
+ struct pinned_pfns *pfns;
int write;
int offset;
struct sg_table sg_table;
@@ -166,9 +167,10 @@ static void *vb2_dma_sg_get_userptr(void *alloc_ctx, struct pinned_pfns **ppfn,
int write)
{
struct vb2_dma_sg_buf *buf;
- unsigned long first, last;
- int num_pages_from_user;
- struct vm_area_struct *vma;
+ struct pinned_pfns *pfns = *ppfn;
+
+ if (pfns_vector_to_pages(pfns))
+ return NULL;
buf = kzalloc(sizeof *buf, GFP_KERNEL);
if (!buf)
@@ -178,75 +180,20 @@ static void *vb2_dma_sg_get_userptr(void *alloc_ctx, struct pinned_pfns **ppfn,
buf->write = write;
buf->offset = vaddr & ~PAGE_MASK;
buf->size = size;
-
- first = (vaddr & PAGE_MASK) >> PAGE_SHIFT;
- last = ((vaddr + size - 1) & PAGE_MASK) >> PAGE_SHIFT;
- buf->num_pages = last - first + 1;
-
- buf->pages = kzalloc(buf->num_pages * sizeof(struct page *),
- GFP_KERNEL);
- if (!buf->pages)
- goto userptr_fail_alloc_pages;
-
- vma = find_vma(current->mm, vaddr);
- if (!vma) {
- dprintk(1, "no vma for address %lu\n", vaddr);
- goto userptr_fail_find_vma;
- }
-
- if (vma->vm_end < vaddr + size) {
- dprintk(1, "vma at %lu is too small for %lu bytes\n",
- vaddr, size);
- goto userptr_fail_find_vma;
- }
-
- buf->vma = vb2_get_vma(vma);
- if (!buf->vma) {
- dprintk(1, "failed to copy vma\n");
- goto userptr_fail_find_vma;
- }
-
- if (vma_is_io(buf->vma)) {
- for (num_pages_from_user = 0;
- num_pages_from_user < buf->num_pages;
- ++num_pages_from_user, vaddr += PAGE_SIZE) {
- unsigned long pfn;
-
- if (follow_pfn(buf->vma, vaddr, &pfn)) {
- dprintk(1, "no page for address %lu\n", vaddr);
- break;
- }
- buf->pages[num_pages_from_user] = pfn_to_page(pfn);
- }
- } else
- num_pages_from_user = get_user_pages(current, current->mm,
- vaddr & PAGE_MASK,
- buf->num_pages,
- write,
- 1, /* force */
- buf->pages,
- NULL);
-
- if (num_pages_from_user != buf->num_pages)
- goto userptr_fail_get_user_pages;
+ buf->pages = pfns_vector_pages(pfns);
+ buf->num_pages = pfns_vector_count(pfns);
if (sg_alloc_table_from_pages(&buf->sg_table, buf->pages,
buf->num_pages, buf->offset, size, 0))
- goto userptr_fail_alloc_table_from_pages;
+ goto fail;
+
+ buf->pfns = pfns;
+ /* Clear *ppfn so that the caller doesn't free the vector */
+ *ppfn = NULL;
return buf;
-userptr_fail_alloc_table_from_pages:
-userptr_fail_get_user_pages:
- dprintk(1, "get_user_pages requested/got: %d/%d]\n",
- buf->num_pages, num_pages_from_user);
- if (!vma_is_io(buf->vma))
- while (--num_pages_from_user >= 0)
- put_page(buf->pages[num_pages_from_user]);
- vb2_put_vma(buf->vma);
-userptr_fail_find_vma:
- kfree(buf->pages);
-userptr_fail_alloc_pages:
+fail:
kfree(buf);
return NULL;
}
@@ -268,11 +215,9 @@ static void vb2_dma_sg_put_userptr(void *buf_priv)
while (--i >= 0) {
if (buf->write)
set_page_dirty_lock(buf->pages[i]);
- if (!vma_is_io(buf->vma))
- put_page(buf->pages[i]);
}
- kfree(buf->pages);
- vb2_put_vma(buf->vma);
+ put_vaddr_pfns(buf->pfns);
+ pfns_vector_destroy(buf->pfns);
kfree(buf);
}
--
1.8.1.4
--
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