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Commit 0eb9acda authored by Lorenzo Stoakes's avatar Lorenzo Stoakes Committed by Daniel Vetter
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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: default avatarLorenzo Stoakes <lstoakes@gmail.com>
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20170227215008.21457-1-lstoakes@gmail.com
parent ac7d3af8

drivers/gpu/drm/via/via_dmablit.c

+3 −7
Original line number Diff line number Diff line
@@ -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;