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drm/etnaviv: put submit prev MMU context when it exists 

commit cda7532916f7bc860b36a1806cb8352e6f63dacb upstream.

The prev context is the MMU context at the time of the job
queueing in hardware. As a job might be queued multiple times
due to recovery after a GPU hang, we need to make sure to put
the stale prev MMU context from a prior queuing, to avoid the
reference and thus the MMU context leaking.

Cc: stable@vger.kernel.org # 5.4
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 22:18:24 +02:00 committed by Greg Kroah-Hartman
parent a9bacefda0
commit ee52ccecfe
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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@ -1310,6 +1310,8 @@ struct dma_fence *etnaviv_gpu_submit(struct etnaviv_gem_submit *submit)
gpu->mmu_context = etnaviv_iommu_context_get(submit->mmu_context);
etnaviv_gpu_start_fe_idleloop(gpu);
} else {
if (submit->prev_mmu_context)
etnaviv_iommu_context_put(submit->prev_mmu_context);
submit->prev_mmu_context = etnaviv_iommu_context_get(gpu->mmu_context);
}