drm/nouveau: remove explicit unmaps

If the VMA is being deleted, we don't need to explicity unmap first
anymore.  The MMU code will automatically merge the operations into
a single page tree walk.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/nouveau_bo.c

@@ -1414,7 +1414,6 @@ nouveau_ttm_io_mem_free(struct ttm_bo_device *bdev, struct ttm_mem_reg *reg)
 	if (!mem->bar_vma.node)
 		return;
 
-	nvkm_vm_unmap(&mem->bar_vma);
 	nvkm_vm_put(&mem->bar_vma);
 }
 

drivers/gpu/drm/nouveau/nouveau_mem.c

@@ -36,14 +36,8 @@ nouveau_mem_map(struct nouveau_mem *mem,
 void
 nouveau_mem_fini(struct nouveau_mem *mem)
 {
-	if (mem->vma[1].node) {
-		nvkm_vm_unmap(&mem->vma[1]);
 	nvkm_vm_put(&mem->vma[1]);
-	}
-	if (mem->vma[0].node) {
-		nvkm_vm_unmap(&mem->vma[0]);
 	nvkm_vm_put(&mem->vma[0]);
-	}
 }
 
 int

drivers/gpu/drm/nouveau/nouveau_vmm.c

@@ -61,10 +61,8 @@ nouveau_vma_del(struct nouveau_vma **pvma)
 {
 	struct nouveau_vma *vma = *pvma;
 	if (vma && --vma->refs <= 0) {
-		if (likely(vma->addr != ~0ULL)) {
-			nouveau_vma_unmap(vma);
+		if (likely(vma->addr != ~0ULL))
 			nvkm_vm_put(&vma->_vma);
-		}
 		list_del(&vma->head);
 		*pvma = NULL;
 		kfree(*pvma);