Hi All, I'd like to ask question about allowed calling context for kthread_mod_delayed_work(). The comment to kthread_mod_delayed_work() says: * This function is safe to call from any context including IRQ handler. * See __kthread_cancel_work() and kthread_delayed_work_timer_fn() * for details. */ But it has del_timer_sync() inside which seems can't be called from hard_irq context: kthread_mod_delayed_work() |-__kthread_cancel_work() |- del_timer_sync() |- WARN_ON(in_irq() && !(timer->flags & TIMER_IRQSAFE)); My use case is related to PTP processing using PTP auxiliary worker: (commit d9535cb7b760 ("ptp: introduce ptp auxiliary worker")): - periodic work A is started and res-schedules itself for every dtX - on IRQ - the work A need to be scheduled immediately Any advice on how to proceed? Can kthread_queue_work() be used even if there is delayed work is scheduled already (in general, don't care if work A will be executed one more time after timer expiration)? -- Best regards, grygorii