From 4366c7e346ce7988119fe7744983f245fe4e818e Mon Sep 17 00:00:00 2001 From: Lucas Stach Date: Wed, 22 Mar 2017 12:07:23 +0100 Subject: drm/etnaviv: (re-)protect fence allocation with GPU mutex commit f3cd1b064f1179d9e6188c6d67297a2360880e10 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: d9853490176c (drm/etnaviv: take GPU lock later in the submit process) Signed-off-by: Lucas Stach Signed-off-by: Greg Kroah-Hartman diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c index b1254f8..b87d278 100644 --- a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c +++ b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c @@ -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; -- cgit v0.10.2