Commit f3cd1b06 authored by Lucas Stach's avatar Lucas Stach

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

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: d9853490 (drm/etnaviv: take GPU lock later in the submit process)
CC: stable@vger.kernel.org #4.9+
Signed-off-by: default avatarLucas Stach <l.stach@pengutronix.de>
parent c1ae3cfa
......@@ -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;
......
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