From: Lucas Stach l.stach@pengutronix.de
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 --- drivers/gpu/drm/etnaviv/etnaviv_gpu.c | 2 ++ 1 file changed, 2 insertions(+)
--- a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c +++ b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c @@ -1310,6 +1310,8 @@ struct dma_fence *etnaviv_gpu_submit(str 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); }