+ 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,