If we fail to allocate a new request, make sure we recover the pages
that are in the process of being freed by inserting an RCU barrier.
Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
---
drivers/gpu/drm/i915/i915_gem_request.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_gem_request.c
b/drivers/gpu/drm/i915/i915_gem_request.c
index 86c86a17d558..94429405e776 100644
--- a/drivers/gpu/drm/i915/i915_gem_request.c
+++ b/drivers/gpu/drm/i915/i915_gem_request.c
@@ -696,6 +696,9 @@ i915_gem_request_alloc(struct intel_engine_cs *engine,
if (ret)
goto err_unreserve;
+ kmem_cache_shrink(dev_priv->requests);
+ rcu_barrier();
+
req = kmem_cache_alloc(dev_priv->requests, GFP_KERNEL);
if (!req) {
ret = -ENOMEM;
--
2.15.1
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