If we create a new node, it is possible for the slab allocator to return
us a recently freed node. If that node was just retired, it will retain
the current jiffy as its node->age. There is then a miniscule window,
where as that node is retired, it will appear on the free list with an
incorrect age and be eligible for reuse by one thread, and then by a
second thread as the correct node->age is written.
Fixes: 8080ffd81600 ("drm/i915/gt: Delay taking the spinlock for grabbing from
the buffer pool")
Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
---
drivers/gpu/drm/i915/gt/intel_gt_buffer_pool.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/gpu/drm/i915/gt/intel_gt_buffer_pool.c
b/drivers/gpu/drm/i915/gt/intel_gt_buffer_pool.c
index 4b7671ac5dca..104cb30e8c13 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_buffer_pool.c
+++ b/drivers/gpu/drm/i915/gt/intel_gt_buffer_pool.c
@@ -134,6 +134,7 @@ static void pool_retire(struct i915_active *ref)
/* Return this object to the shrinker pool */
i915_gem_object_make_purgeable(node->obj);
+ GEM_BUG_ON(node->age);
spin_lock_irqsave(&pool->lock, flags);
list_add_rcu(&node->link, list);
WRITE_ONCE(node->age, jiffies ?: 1); /* 0 reserved for active nodes */
@@ -155,6 +156,7 @@ node_create(struct intel_gt_buffer_pool *pool, size_t sz)
if (!node)
return ERR_PTR(-ENOMEM);
+ node->age = 0;
node->pool = pool;
i915_active_init(&node->active, pool_active, pool_retire);
--
2.20.1
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