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drm/via: use get_user_pages_unlocked() 

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 <lstoakes@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20170227215008.21457-1-lstoakes@gmail.com
This commit is contained in:
Lorenzo Stoakes 2017-02-27 21:50:08 +00:00 committed by Daniel Vetter
parent ac7d3af84b
commit 0eb9acda36
1 changed files with 3 additions and 7 deletions
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10
drivers/gpu/drm/via/via_dmablit.c
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@ -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;