From 77c406038e830a4b6219b14a116cd2a6ac9f4908 Mon Sep 17 00:00:00 2001 From: Rob Clark Date: Fri, 23 Oct 2020 09:51:15 -0700 Subject: drm/msm: Document and rename preempt_lock Before adding another lock, give ring->lock a more descriptive name. Signed-off-by: Rob Clark Reviewed-by: Jordan Crouse Reviewed-by: Kristian H. Kristensen Signed-off-by: Rob Clark --- drivers/gpu/drm/msm/msm_ringbuffer.h | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) (limited to 'drivers/gpu/drm/msm/msm_ringbuffer.h') diff --git a/drivers/gpu/drm/msm/msm_ringbuffer.h b/drivers/gpu/drm/msm/msm_ringbuffer.h index 0987d6bf848c..4956d1bc5d0e 100644 --- a/drivers/gpu/drm/msm/msm_ringbuffer.h +++ b/drivers/gpu/drm/msm/msm_ringbuffer.h @@ -46,7 +46,12 @@ struct msm_ringbuffer { struct msm_rbmemptrs *memptrs; uint64_t memptrs_iova; struct msm_fence_context *fctx; - spinlock_t lock; + + /* + * preempt_lock protects preemption and serializes wptr updates against + * preemption. Can be aquired from irq context. + */ + spinlock_t preempt_lock; }; struct msm_ringbuffer *msm_ringbuffer_new(struct msm_gpu *gpu, int id, -- cgit v1.2.3