[PATCH RESEND] drm/via: use get_user_pages_unlocked()

[Lorenzo Stoakes]

Moving from get_user_pages() to get_user_pages_unlocked() simplifies the code
and takes advantage of VM_FAULT_RETRY functionality when faulting in pages.

Signed-off-by: Lorenzo Stoakes <lstoa...@gmail.com>
---
 drivers/gpu/drm/via/via_dmablit.c | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/via/via_dmablit.c 
b/drivers/gpu/drm/via/via_dmablit.c
index 1a3ad769f8c8..98aae9809249 100644
--- a/drivers/gpu/drm/via/via_dmablit.c
+++ b/drivers/gpu/drm/via/via_dmablit.c
@@ -238,13 +238,9 @@ via_lock_all_dma_pages(drm_via_sg_info_t *vsg,  
drm_via_dmablit_t *xfer)
        vsg->pages = vzalloc(sizeof(struct page *) * vsg->num_pages);
        if (NULL == vsg->pages)
                return -ENOMEM;
-       down_read(&current->mm->mmap_sem);
-       ret = get_user_pages((unsigned long)xfer->mem_addr,
-                            vsg->num_pages,
-                            (vsg->direction == DMA_FROM_DEVICE) ? FOLL_WRITE : 
0,
-                            vsg->pages, NULL);
-
-       up_read(&current->mm->mmap_sem);
+       ret = get_user_pages_unlocked((unsigned long)xfer->mem_addr,
+                       vsg->num_pages, vsg->pages,
+                       (vsg->direction == DMA_FROM_DEVICE) ? FOLL_WRITE : 0);
        if (ret != vsg->num_pages) {
                if (ret < 0)
                        return ret;
-- 
2.11.1

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