From f3cd1b064f1179d9e6188c6d67297a2360880e10 Mon Sep 17 00:00:00 2001 From: Lucas Stach Date: Wed, 22 Mar 2017 12:07:23 +0100 Subject: [PATCH] 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: d9853490176c (drm/etnaviv: take GPU lock later in the submit process) CC: stable@vger.kernel.org #4.9+ Signed-off-by: Lucas Stach --- drivers/gpu/drm/etnaviv/etnaviv_gpu.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c index 130d7d517a19..da48819ff2e6 100644 --- a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c +++ b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c @@ -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; -- 2.20.1