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drm/msm/a5xx: fix the emptyness check in the preempt code

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[ Upstream commit b4fb748f0b734ce1d2e7834998cc599fcbd25d67 ]

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 <y.oudjana@protonmail.com>
Fixes: b1fc2839d2 ("drm/msm: Implement preemption for A5XX targets")
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/522642/
Link: https://lore.kernel.org/r/20230214020956.164473-4-dmitry.baryshkov@linaro.org
Signed-off-by: Rob Clark <robdclark@chromium.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Dmitry Baryshkov
2023-02-14 05:09:55 +03:00
committed by Greg Kroah-Hartman
parent 8dde1d9d6f
commit 34e71ca0a0
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/msm/adreno/a5xx_preempt.c
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@@ -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)