atomisp: use get_user_pages_fast()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/drivers/staging/media/atomisp/pci/atomisp2/hmm/hmm_bo.c b/drivers/staging/media/atomisp/pci/atomisp2/hmm/hmm_bo.c
index 11162f595fc745846a11dd56d275e6b631ab249a..2052f8d2f1375f1b3db27af212dae54818d982f7 100644 (file)
--- a/drivers/staging/media/atomisp/pci/atomisp2/hmm/hmm_bo.c
+++ b/drivers/staging/media/atomisp/pci/atomisp2/hmm/hmm_bo.c
@@ -1029,10 +1029,8 @@ static int alloc_user_pages(struct hmm_buffer_object *bo,
        } else {
                /*Handle frame buffer allocated in user space*/
                mutex_unlock(&bo->mutex);
-               down_read(&current->mm->mmap_sem);
-               page_nr = get_user_pages((unsigned long)userptr,
-                                        (int)(bo->pgnr), 1, pages, NULL);
-               up_read(&current->mm->mmap_sem);
+               page_nr = get_user_pages_fast((unsigned long)userptr,
+                                        (int)(bo->pgnr), 1, pages);
                mutex_lock(&bo->mutex);
                bo->mem_type = HMM_BO_MEM_TYPE_USER;
        }