Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx> 于2023年3月17日周五 02:09写道： > > On Fri, Mar 17, 2023 at 01:54:57AM +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 > > Please use spaces for this, as something went wrong and it does not line > up :( Oh yes, will do in the next version. Thanks for your advice :) Best regards, Zheng
