down_read(¤t->mm->mmap_sem);
ret = get_user_pages((unsigned long)xfer->mem_addr,
vsg->num_pages,
- (vsg->direction == DMA_FROM_DEVICE),
- 0, vsg->pages, NULL);
+ (vsg->direction == DMA_FROM_DEVICE) ? FOLL_WRITE : 0,
+ vsg->pages, NULL);
up_read(¤t->mm->mmap_sem);
if (ret != vsg->num_pages) {