[Intel-gfx] [PATCH] drm/i915/gt: Pin the rings before marking active

[Matthew Auld]

On Mon, 6 Jul 2020 at 18:01, Chris Wilson <chris at chris-wilson.co.uk> 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 at chris-wilson.co.uk>
> Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> Cc: <stable at vger.kernel.org> # v5.6+
Reviewed-by: Matthew Auld <matthew.auld at intel.com>