drm/etnaviv: fix MMU context leak on GPU reset

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: stable@vger.kernel.org # 5.4
Reported-by: Michael Walle <michael@walle.cc>
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Tested-by: Michael Walle <michael@walle.cc>
Tested-by: Marek Vasut <marex@denx.de>
Reviewed-by: Christian Gmeiner <christian.gmeiner@gmail.com>

diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
index 3d64bc3..bc2bdfc 100644 (file)
--- 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;