On Thu, Aug 25, 2022 at 1:24 AM Alan Stern [off-list ref] wrote:

udev is not a usb_device structure; it is a _pointer_ to a usb_device
structure.  The pointer is created when ehset_single_step_set_feature()
calls usb_hub_find_child(), but the structure itself gets created long
before that, when the USB device is first detected and initialized.

You can see this happening where hub_port_connect() calls
usb_alloc_dev().  The ep0 field is filled in by hub_port_init() and the
routines it calls.

Thanks for clarifying this. That helps a lot.

-- Khalid Masum
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