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drm/etnaviv: fix GPU vs sync point race 

If the FE is restarted before the sync point event is cleared, the GPU
might trigger a completion IRQ for the next sync point, corrupting
the state of the currently running worker.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Reviewed-by: Christian Gmeiner <christian.gmeiner@gmail.com>
This commit is contained in:
Lucas Stach 2017-10-19 13:48:40 +02:00
parent 49b82c389d
commit b9a48aa76c
1 changed files with 6 additions and 10 deletions
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16
drivers/gpu/drm/etnaviv/etnaviv_gpu.c
View File

@ -1484,22 +1484,18 @@ out_pm_put:
return ret;
}
static void etnaviv_process_sync_point(struct etnaviv_gpu *gpu,
struct etnaviv_event *event)
{
u32 addr = gpu_read(gpu, VIVS_FE_DMA_ADDRESS);
event->sync_point(gpu, event);
etnaviv_gpu_start_fe(gpu, addr + 2, 2);
}
static void sync_point_worker(struct work_struct *work)
{
struct etnaviv_gpu *gpu = container_of(work, struct etnaviv_gpu,
sync_point_work);
struct etnaviv_event *event = &gpu->event[gpu->sync_point_event];
u32 addr = gpu_read(gpu, VIVS_FE_DMA_ADDRESS);
etnaviv_process_sync_point(gpu, &gpu->event[gpu->sync_point_event]);
event->sync_point(gpu, event);
event_free(gpu, gpu->sync_point_event);
/* restart FE last to avoid GPU and IRQ racing against this worker */
etnaviv_gpu_start_fe(gpu, addr + 2, 2);
}
/*