On Fri, Aug 22, 2025 at 10:46:02AM +0800, ccc194101@xxxxxxx wrote: > From: chenchangcheng <chenchangcheng@xxxxxxxxxx> > > When an Apple device is inserted into the host, and the host > wakes up from S3/S4 power states, if the reset_resume process > is triggered, the absence of a reset_resume callback in usbfs will > cause the device to unbind. > By adding a reset_resume callback to usbfs and reporting REMOVE and ADD > uevents in reset_resume, the userspace is prompted to reissue commands > to re-establish the binding with usbfs. usbfs has no way to inform userspace when the device is reset. This is true for normal resets as well as for reset-resumes (no pre_reset, post_reset, or reset_resume callbacks). I don't see any point in trying to add support for the latter but not the former. Unbinding the device forces userspace to re-open the device file and establish a new binding. How does adding REMOVE and ADD uevents make the situation any better than it already is? Alan Stern
