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[02/31] drm/i915/execlists: Check for ce->state before destroy

Message ID 20180625094842.8499-2-chris@chris-wilson.co.uk (mailing list archive)
State New, archived
Headers show

Commit Message

Chris Wilson June 25, 2018, 9:48 a.m. UTC
As we may cancel the ce->state allocation during context pinning (but
crucially after we mark ce as operational), that means we may be asked
to destroy a nonexistent ce->state. Given the choice in handing a
complex error path on pinning, and just ignoring the lack of state in
destroy, choice the latter for simplicity.

Reported-by: Zhao Yakui <yakui.zhao@intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
---
 drivers/gpu/drm/i915/intel_lrc.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)
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Patch

diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index 33bc914c2ef5..02ee3b12507f 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -1337,11 +1337,15 @@  static void execlists_schedule(struct i915_request *request,
 
 static void execlists_context_destroy(struct intel_context *ce)
 {
-	GEM_BUG_ON(!ce->state);
 	GEM_BUG_ON(ce->pin_count);
 
+	if (!ce->state)
+		return;
+
+	GEM_BUG_ON(i915_gem_object_is_active(ce->state->obj));
+
 	intel_ring_free(ce->ring);
-	__i915_gem_object_release_unless_active(ce->state->obj);
+	i915_gem_object_put(ce->state->obj);
 }
 
 static void execlists_context_unpin(struct intel_context *ce)