This should be impossible, but let's assert that we do not pin a context
4 billion times before retiring!
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxxxxxxxx>
Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/intel_lrc.c | 1 +
drivers/gpu/drm/i915/intel_ringbuffer.c | 1 +
2 files changed, 2 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index 32ec06245281..77574dfc48ef 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -747,6 +747,7 @@ static int execlists_context_pin(struct intel_engine_cs *engine,
if (ce->pin_count++)
return 0;
+ GEM_BUG_ON(ce->pin_count); /* no overflow please! */
if (!ce->state) {
ret = execlists_context_deferred_alloc(ctx, engine);
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index e895c99f5dd9..758191e69403 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -1445,6 +1445,7 @@ static int intel_ring_context_pin(struct intel_engine_cs *engine,
if (ce->pin_count++)
return 0;
+ GEM_BUG_ON(ce->pin_count); /* no overflow please! */
if (ce->state) {
ret = context_pin(ctx);
--
2.11.0
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