drm/i915/gt: Restore check for invalid vma for fencing
Apparently we do try and attach a fence to an invalid vma (during execbuf) so we cannot simply assert it never happens and report EINVAL instead. Fixes: dec9cf9e ("drm/i915/gt: Pull restoration of GGTT fences underneath the GT") Signed-off-by:Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by:
Mika Kuoppala <mika.kuoppala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20200316205450.15843-1-chris@chris-wilson.co.uk
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