[Intel-gfx] [PATCH] drm/i915/selftests: Take an explicit ref for rq->batch

[Chris Wilson]

Since we are peeking into the batch object of the request, it is
beholden on us to hold a reference to it.

Closes: https://gitlab.freedesktop.org/drm/intel/issues/1634
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/gt/selftest_lrc.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/gt/selftest_lrc.c b/drivers/gpu/drm/i915/gt/selftest_lrc.c
index 57db3d0ffaf2..c14ecdd04ec3 100644
--- a/drivers/gpu/drm/i915/gt/selftest_lrc.c
+++ b/drivers/gpu/drm/i915/gt/selftest_lrc.c
@@ -2655,7 +2655,7 @@ static int create_gang(struct intel_engine_cs *engine,
 	if (IS_ERR(rq))
 		goto err_obj;
 
-	rq->batch = vma;
+	rq->batch = i915_vma_get(vma);
 	i915_request_get(rq);
 
 	i915_vma_lock(vma);
@@ -2775,6 +2775,7 @@ static int live_preempt_gang(void *arg)
 				err = -ETIME;
 			}
 
+			i915_vma_put(rq->batch);
 			i915_request_put(rq);
 			rq = n;
 		}
-- 
2.20.1