From: Al Viro <viro@zeniv.linux.org.uk>
Date: Fri, 22 Sep 2017 22:21:11 +0000 (-0400)
Subject: atomisp: use get_user_pages_fast()
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=e1a58a5421c6a9f4ab74810d6ecbbdb6b1b2e2c7;p=linux.git

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 11162f595fc74..2052f8d2f1375 100644
--- 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;
 	}