drm/i915/selftests: Always hold a reference on a waited upon request
Whenever we wait on a request, make sure we actually hold a reference to it and that it cannot be retired/freed on another CPU! Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Acked-by: Mika Kuoppala <mika.kuoppala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20191121071044.97798-4-chris@chris-wilson.co.uk
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