[PATCH 6/8] drm/etnaviv: fix MMU context leak on GPU reset

[Lucas Stach]

After a reset the GPU is no longer using the MMU context and may be
restarted with a different context. While the mmu_state proeprly was
cleared, the context wasn't unreferenced, leading to a memory leak.

Cc: sta...@vger.kernel.org # 5.4
Reported-by: Michael Walle <mich...@walle.cc>
Signed-off-by: Lucas Stach <l.st...@pengutronix.de>
Tested-by: Michael Walle <mich...@walle.cc>
---
 drivers/gpu/drm/etnaviv/etnaviv_gpu.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c 
b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
index 9c710924df6b..f420c4f14657 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
@@ -571,6 +571,8 @@ static int etnaviv_hw_reset(struct etnaviv_gpu *gpu)
 
        gpu->fe_running = false;
        gpu->exec_state = -1;
+       if (gpu->mmu_context)
+               etnaviv_iommu_context_put(gpu->mmu_context);
        gpu->mmu_context = NULL;
 
        return 0;
-- 
2.30.2