On Mon, 6 Jul 2020 at 18:01, Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> wrote:
>
> On eviction, we acquire the vm->mutex and then wait on the vma->active.
> Thereore when binding and pinning the vma, we must follow the same
> sequence, lock/pin the vma then mark it active. Otherwise, we mark the
> vma as active, then wait for the vm->mutex, and meanwhile the evictor
> holding the mutex waits upon us to complete our activity.
>
> Fixes: 8ccfc20a7d56 ("drm/i915/gt: Mark ring->vma as active while pinned")
> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
> Cc: <stable@xxxxxxxxxxxxxxx> # v5.6+
Reviewed-by: Matthew Auld <matthew.auld@xxxxxxxxx>
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