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

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commit f3cd1b064f upstream.

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)
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Lucas Stach
2017-03-22 12:07:23 +01:00
committed by Greg Kroah-Hartman
parent 6acf520708
commit 4366c7e346
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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@@ -1299,6 +1299,8 @@ 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);
@@ -1306,8 +1308,6 @@ 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;