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drm/etnaviv: fix MMU context leak on GPU reset 

commit f978a5302f5566480c58ffae64a16d34456801bd upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Lucas Stach 2021-08-20 22:18:28 +02:00 committed by Greg Kroah-Hartman
parent 5e67b38435
commit 5827dbac41
1 changed files with 2 additions and 0 deletions
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2
drivers/gpu/drm/etnaviv/etnaviv_gpu.c
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@ -547,6 +547,8 @@ 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;