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drm/i915: Add a simple is-bound check before unbinding 

Only acquire the various atomic references required to unbind the vma if
we do need to unbind the vma.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Acked-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191222210256.2066451-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2019-12-22 21:02:54 +00:00
parent 4941f35b48
commit f5af1659d8
1 changed files with 4 additions and 1 deletions
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5
drivers/gpu/drm/i915/i915_gem.c
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@ -138,6 +138,10 @@ int i915_gem_object_unbind(struct drm_i915_gem_object *obj,
struct i915_address_space *vm = vma->vm;
bool awake = false;
list_move_tail(&vma->obj_link, &still_in_list);
if (!i915_vma_is_bound(vma, I915_VMA_BIND_MASK))
continue;
ret = -EAGAIN;
if (!i915_vm_tryopen(vm))
break;
@ -153,7 +157,6 @@ int i915_gem_object_unbind(struct drm_i915_gem_object *obj,
}
}
list_move_tail(&vma->obj_link, &still_in_list);
spin_unlock(&obj->vma.lock);
ret = -EBUSY;