Quoting Yassine: ring->memptrs->rptr is never updated and stays 0, so the comparison always evaluates to false and get_next_ring always returns ring 0 thinking it isn't empty.
Fix this by calling get_rptr() instead of reading rptr directly. Reported-by: Yassine Oudjana <[email protected]> Fixes: b1fc2839d2f9 ("drm/msm: Implement preemption for A5XX targets") Signed-off-by: Dmitry Baryshkov <[email protected]> --- drivers/gpu/drm/msm/adreno/a5xx_preempt.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/msm/adreno/a5xx_preempt.c b/drivers/gpu/drm/msm/adreno/a5xx_preempt.c index 7658e89844b4..7e0affd60993 100644 --- a/drivers/gpu/drm/msm/adreno/a5xx_preempt.c +++ b/drivers/gpu/drm/msm/adreno/a5xx_preempt.c @@ -63,7 +63,7 @@ static struct msm_ringbuffer *get_next_ring(struct msm_gpu *gpu) struct msm_ringbuffer *ring = gpu->rb[i]; spin_lock_irqsave(&ring->preempt_lock, flags); - empty = (get_wptr(ring) == ring->memptrs->rptr); + empty = (get_wptr(ring) == gpu->funcs->get_rptr(gpu, ring)); spin_unlock_irqrestore(&ring->preempt_lock, flags); if (!empty) -- 2.30.2
