On 21-08-02 17:35:01, Jeaho Hwang wrote: > Hi. > > We found an infinite loop inside the function hw_ep_set_halt > (drivers/usb/chipidea/udc.c) if a cablle is repeatedly > connnected/disconnected while ping through RNDIS with chipidea USB device. > > Using ftrace tracing, we found that hw_ep_set_halt is called due to error > return of hw_ep_prime(drivers/usb/chipidea/udc.c:202) which is called from > isr_tr_complete_handler -> isr_setup_status_phase -> _ep_queue. > > The comment of function hw_ep_prime says (execute without interruption) but > timer interrupt is occurred while hw_ep_prime is executing. We believe that > the interrupt causes an error return of hw_ep_prime. We tried to protect > hw_ep_prime from irqs and then no case of the infinite loop is occurred. > > I want ask if it is appropriate way that turning off irq inside (threaded) > irq handlers. And should we explicitly turn off irqs before calling > hw_ep_prime? > Jeaho, do you use RT-Linux or standard Linux? The function hw_ep_prime is only called at udc_irq which is registered as top-half irq handlers. Why the timer interrupt is occurred when hw_ep_prime is executing? -- Thanks, Peter Chen
