Mesa (staging/21.2): freedreno/drm: Move pipe unref after fence removal
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Mon Oct 11 16:26:39 UTC 2021
Module: Mesa
Branch: staging/21.2
Commit: 7dcced8e7400d631bb22e62701c0fe7d8d9e3dd2
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=7dcced8e7400d631bb22e62701c0fe7d8d9e3dd2
Author: Rob Clark <robdclark at chromium.org>
Date: Thu Oct 7 16:59:53 2021 -0700
freedreno/drm: Move pipe unref after fence removal
Dropping the final pipe ref could in turn drop the final ref to one
of a couple other bo's, which in turn could indirectly recurse back
into cleanup_fences() on the same bo, resulting in a double decrement
of bo->nr_fences and underflow to a large positive #. This happens
because free'ing a bo back to the bo cache periodically calls
fd_bo_cache_cleanup() and any bo's that have not been re-used can
be really free'd, which in turn calls cleanup_fences().
Fixes: 7dabd624649 ("freedreno/drm: Userspace fences")
Signed-off-by: Rob Clark <robdclark at chromium.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/13263>
(cherry picked from commit faed3d4dfe37b9ca0afb10a63854a1c9fa05bc4f)
---
.pick_status.json | 2 +-
src/freedreno/drm/freedreno_bo.c | 5 ++++-
2 files changed, 5 insertions(+), 2 deletions(-)
diff --git a/.pick_status.json b/.pick_status.json
index 65b18e397df..8f202ee34a3 100644
--- a/.pick_status.json
+++ b/.pick_status.json
@@ -508,7 +508,7 @@
"description": "freedreno/drm: Move pipe unref after fence removal",
"nominated": true,
"nomination_type": 1,
- "resolution": 0,
+ "resolution": 1,
"main_sha": null,
"because_sha": "7dabd62464982e545a094f22d9ca23a77730c536"
},
diff --git a/src/freedreno/drm/freedreno_bo.c b/src/freedreno/drm/freedreno_bo.c
index 7be0c7839a0..2039377e5ca 100644
--- a/src/freedreno/drm/freedreno_bo.c
+++ b/src/freedreno/drm/freedreno_bo.c
@@ -315,7 +315,8 @@ cleanup_fences(struct fd_bo *bo, bool expired)
if (expired && fd_fence_before(f->pipe->control->fence, f->fence))
continue;
- fd_pipe_del_locked(f->pipe);
+ struct fd_pipe *pipe = f->pipe;
+
bo->nr_fences--;
if (bo->nr_fences > 0) {
@@ -323,6 +324,8 @@ cleanup_fences(struct fd_bo *bo, bool expired)
bo->fences[i] = bo->fences[bo->nr_fences];
i--;
}
+
+ fd_pipe_del_locked(pipe);
}
}
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