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gadgetfs: how to wait for USB device initialization?

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Hi!

I'm trying to use gadgetfs to fuzz USB device drivers by simply
connecting random devices for now.

What I want to achieve right now is the following:

1. mount gadgetfs
2. emulate connection of a new USB device
3. wait for the device to finish initializing
4. unmount gadgetfs
5. goto 1

The question is how do I wait for the device to finish initializing
(the corresponding USB driver to finish probing?) before unmounting
gadgetfs? As I understand, when I write device description to
"/dev/gadget/dummy_udc" the initialization happens asynchronously
after writing is done.

To mount and unmount gadgetfs right now I do:
mount("none", "/dev/gadget", "gadgetfs", 0, NULL)
umount2("/dev/gadget", MNT_FORCE | MNT_DETACH)

Thanks!

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Thread

gadgetfs: how to wait for USB device initialization? Andrey Konovalov <andreyknvl@google.com> - 2017-06-13 14:30 +0200
  Re: gadgetfs: how to wait for USB device initialization? Alan Stern <stern@rowland.harvard.edu> - 2017-06-13 16:50 +0200
  Re: gadgetfs: how to wait for USB device initialization? Tal Shorer <tal.shorer@gmail.com> - 2017-06-13 18:10 +0200
    Re: gadgetfs: how to wait for USB device initialization? Tal Shorer <tal.shorer@gmail.com> - 2017-06-13 18:30 +0200
      Re: gadgetfs: how to wait for USB device initialization? Andrey Konovalov <andreyknvl@google.com> - 2017-06-13 20:10 +0200

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