[PATCH] drm/etnaviv: don't put fence in case of submit failure

[Lucas Stach]

If we bail out of the submit before actually adding the cmdstream
to the kernel ring there is no valid fence to put. Make sure to skip
the fence_put in that case.

Signed-off-by: Lucas Stach <l.stach at pengutronix.de>
---
 drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c b/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c
index e1909429837e..de80ee1b71df 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c
@@ -44,6 +44,7 @@ static struct etnaviv_gem_submit *submit_create(struct drm_device *dev,
 
 		/* initially, until copy_from_user() and bo lookup succeeds: */
 		submit->nr_bos = 0;
+		submit->fence = NULL;
 
 		ww_acquire_init(&submit->ticket, &reservation_ww_class);
 	}
@@ -294,7 +295,8 @@ static void submit_cleanup(struct etnaviv_gem_submit *submit)
 	}
 
 	ww_acquire_fini(&submit->ticket);
-	dma_fence_put(submit->fence);
+	if (submit->fence)
+		dma_fence_put(submit->fence);
 	kfree(submit);
 }
 
-- 
2.11.0