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Subject[PATCH AUTOSEL for 4.9 40/56] drm/i915: Assert no external observers when unwind a failed request alloc
Date
From: Chris Wilson <chris@chris-wilson.co.uk>

[ Upstream commit 1618bdb89b5d8b47edf42d9c6ea96ecf001ad625 ]

Before we return the request back to the kmem_cache after a failed
i915_gem_request_alloc(), we should assert that it has not been added to
any global state tracking.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20161125131718.20978-2-chris@chris-wilson.co.uk
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
---
drivers/gpu/drm/i915/i915_gem_request.c | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_gem_request.c b/drivers/gpu/drm/i915/i915_gem_request.c
index 8832f8ec1583..71e284d7c640 100644
--- a/drivers/gpu/drm/i915/i915_gem_request.c
+++ b/drivers/gpu/drm/i915/i915_gem_request.c
@@ -455,6 +455,11 @@ i915_gem_request_alloc(struct intel_engine_cs *engine,
return req;

err_ctx:
+ /* Make sure we didn't add ourselves to external state before freeing */
+ GEM_BUG_ON(!list_empty(&req->active_list));
+ GEM_BUG_ON(!list_empty(&req->priotree.signalers_list));
+ GEM_BUG_ON(!list_empty(&req->priotree.waiters_list));
+
i915_gem_context_put(ctx);
err:
kmem_cache_free(dev_priv->requests, req);
--
2.11.0
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