drm/i915: Don't pin the object pages during pending vma binds

A pin-count is already held by vma->pages so taking an additional pin
during async binds is not necessary.

When we introduce async unbinding we have other means of keeping the
object pages alive.

Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220110172219.107131-4-thomas.hellstrom@linux.intel.com

drivers/gpu/drm/i915/i915_vma.c

@@ -305,10 +305,8 @@ static void __vma_release(struct dma_fence_work *work)
 {
 	struct i915_vma_work *vw = container_of(work, typeof(*vw), base);
 
-	if (vw->pinned) {
-		__i915_gem_object_unpin_pages(vw->pinned);
+	if (vw->pinned)
 		i915_gem_object_put(vw->pinned);
-	}
 
 	i915_vm_free_pt_stash(vw->vm, &vw->stash);
 	i915_vm_put(vw->vm);
@@ -477,7 +475,6 @@ int i915_vma_bind(struct i915_vma *vma,
 
 		work->base.dma.error = 0; /* enable the queue_work() */
 
-		__i915_gem_object_pin_pages(vma->obj);
 		work->pinned = i915_gem_object_get(vma->obj);
 	} else {
 		if (vma->obj) {