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@xxxxxxxxxxxxxxx # 5.4
Signed-off-by: Lucas Stach <l.stach@xxxxxxxxxxxxxx>
Tested-by: Michael Walle <michael@xxxxxxxx>
---
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 c8b9b0cc4442..c1b9c5cbed11 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
@@ -1368,6 +1368,8 @@ 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);
}
--
2.30.2
