[Barebox] Polling infrastructure causes reentrancy problem

[Sascha Hauer]

Hi Christian,

On Fri, Nov 05, 2021 at 01:40:52PM +0100, Christian Eggers wrote:
> Disclaimer: I stumbled over this on barebox 2020.01.
> I haven't tried to reproduce this on the current version.

Please update to a recent barebox. The fastboot commands now run in a
workqueue which itself only runs when we are outside any critical pathes
in barebox.
Particularly fastboot commands will only execute when you called
command_slice_release() beforehand. You'll have to call
command_slice_acquire() before entering any critical pathes like probing
for USB devices.

Regards,
  Sascha

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