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drm/etnaviv: (re-)protect fence allocation with GPU mutex

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The fence allocation needs to be protected by the GPU mutex, otherwise
the fence seqnos of concurrent submits might not match the insertion order
of the jobs in the kernel ring. This breaks the assumption that jobs
complete with monotonically increasing fence seqnos.

Fixes: d985349017 (drm/etnaviv: take GPU lock later in the submit process)
CC: stable@vger.kernel.org #4.9+
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
This commit is contained in:
Lucas Stach 2017-03-22 12:07:23 +01:00
parent c1ae3cfa0e
commit f3cd1b064f
1 changed files with 2 additions and 2 deletions
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4
drivers/gpu/drm/etnaviv/etnaviv_gpu.c
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@ -1311,6 +1311,8 @@ int etnaviv_gpu_submit(struct etnaviv_gpu *gpu,
goto out_pm_put;
}
mutex_lock(&gpu->lock);
fence = etnaviv_gpu_fence_alloc(gpu);
if (!fence) {
event_free(gpu, event);
@ -1318,8 +1320,6 @@ int etnaviv_gpu_submit(struct etnaviv_gpu *gpu,
goto out_pm_put;
}
mutex_lock(&gpu->lock);
gpu->event[event].fence = fence;
submit->fence = fence->seqno;
gpu->active_fence = submit->fence;