/** * synchronize_hardirq - wait for pending hard IRQ handlers (on other CPUs) * @irq: interrupt number to wait for * * This function waits for any pending hard IRQ handlers for this * interrupt to complete before returning. If you use this * function while holding a resource the IRQ handler may need you * will deadlock. It does not take associated threaded handlers * into account. * * Do not use this for shutdown scenarios where you must be sure * that all parts (hardirq and threaded handler) have completed. * * This function may be called - with care - from IRQ context. */ void synchronize_hardirq(unsigned int irq) { struct irq_desc *desc = irq_to_desc(irq); if (desc) __synchronize_hardirq(desc); }
/** * synchronize_hardirq - wait for pending hard IRQ handlers (on other CPUs) * @irq: interrupt number to wait for * * This function waits for any pending hard IRQ handlers for this * interrupt to complete before returning. If you use this * function while holding a resource the IRQ handler may need you * will deadlock. It does not take associated threaded handlers * into account. * * Do not use this for shutdown scenarios where you must be sure * that all parts (hardirq and threaded handler) have completed. * * Returns: false if a threaded handler is active. * * This function may be called - with care - from IRQ context. */ bool synchronize_hardirq(unsigned int irq) { struct irq_desc *desc = irq_to_desc(irq); if (desc) { __synchronize_hardirq(desc); return !atomic_read(&desc->threads_active); } return true; }
/** * synchronize_irq - wait for pending IRQ handlers (on other CPUs) * @irq: interrupt number to wait for * * This function waits for any pending IRQ handlers for this interrupt * to complete before returning. If you use this function while * holding a resource the IRQ handler may need you will deadlock. * * This function may be called - with care - from IRQ context. */ void synchronize_irq(unsigned int irq) { struct irq_desc *desc = irq_to_desc(irq); if (desc) { __synchronize_hardirq(desc); /* * We made sure that no hardirq handler is * running. Now verify that no threaded handlers are * active. */ wait_event(desc->wait_for_threads, !atomic_read(&desc->threads_active)); } }