irq_disable
if (engine->irq_disable) {
engine->irq_disable(engine);
irq_disable(engine);
irq_disable(engine);
irq_disable(engine);
engine->irq_disable = gen8_logical_ring_disable_irq;
engine->irq_disable = gen6_irq_disable;
engine->irq_disable = gen5_irq_disable;
engine->irq_disable = i9xx_irq_disable;
engine->irq_disable = i8xx_irq_disable;
engine->irq_disable = hsw_vebox_irq_disable;
void (*irq_disable)(struct intel_engine_cs *engine);
goto irq_disable;
irq_disable:
goto irq_disable;