Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx> 于2023年3月17日周五 03:07写道： > > On Fri, Mar 17, 2023 at 02:16:23AM +0800, Zheng Wang wrote: > > In renesas_usb3_probe, role_work is bound with renesas_usb3_role_work. > > renesas_usb3_start will be called to start the work. > > > > If we remove the driver which will call usbhs_remove, there may be > > an unfinished work. The possible sequence is as follows: > > > > Fix it by canceling the work before cleanup in the renesas_usb3_remove. > > > > Note that removing a driver is a root-only operation, and should never > > happen. > > > > CPU0 CPU1 > > > > renesas_usb3_role_work > > renesas_usb3_remove > > usb_role_switch_unregister > > device_unregister > > kfree(sw) > > free usb3->role_sw > > usb_role_switch_set_role > > //use usb3->role_sw > > No line at all? > Sorry, I'll remove the empty line. And I think there are other ways to trigger device's remove like directly unpluging the USB device if accessible. I think we nee to append this msg in the next version. Best regards, Zheng
