On Wed, Aug 19, 2020 at 04:08:51PM -0700, Guenter Roeck wrote: > usb_set_interface() should not be called anymore after uvc_disconnect(), > or at east I think so (is that documented anywhere ?).
It may be documented somewhere, but basically it goes without saying. A main feature of the device model design is that drivers get bound to devices by having their probe routine called, and they get unbound by having their disconnect routine called. It should go without saying that once a driver is unbound from a device, it must not communicate with that device any more. It might be nice if this requirement could be enforced (say in the USB core), but doing so is impractical. It would require every I/O request to include some sort of cookie proving that the caller is authorized to make the request. That's not how the kernel works; it trusts drivers to generally do the right thing without constant checking. Alan Stern
