On 11.07.24 10:43, Hongyu Xie wrote:
During hibernation, usb_resume_interface will set needs_binding to 1 if the usb_driver has no reset_resume implimentation. The USB interface will be rebind after usb_resume_complete. Normally, that's fine. But if a USB interface has a matched kernel driver, and a userspace driver or application is using this USB interface through usbfs during hibernation, usbfs will be detatched with the USB interface after resume. And this USB interface will be bind with a kernel driver instead of usbfs. So add reset_resume to fix this.
The device has lost all settings, yet we continue like nothing changed. That strikes me as a very bad idea. If a device has undergone a reset user space has not requested, we need to return an error upon the next interaction. I am sorry, but this implementation has some fundamental issues. Regards Oliver
