linux-kernel - Commit *driver core: emit uevents when device is bound to a driver* causes regression

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Date:   Fri, 6 Apr 2018 14:20:40 +0200
From:   Paul Menzel <pmenzel+linux-input@...gen.mpg.de>
To:     Michael Tokarev <mjt@....msk.ru>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-input@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Ben Caradoc-Davies <ben@...nsient.nz>
Subject: Commit *driver core: emit uevents when device is bound to a driver*
 causes regression

Dear Linux folks,

Commit 1455cf8 (driver core: emit uevents when device is bound to a
driver) [1], introduced in Linux 4.14-rc1, causes a regression in user 
space.

After disconnecting USB devices, they are still shown as plugged in [2][3].

> I seem to be having a similar issue, but with an iPhone X using USB
> to provide internet access. Even after the phone is disconnected, it
> still shows up as "loaded active plugged". The only way to fix this
> is to reboot or use a different USB port.

`git bisect` shows that commit 1455cf8 (driver core: emit uevents when 
device is bound to a driver) is at fault [4].

As user space should not break with newer Linux kernels, do you know 
what to do about that or can you think of a fix?

Kind regards,

Paul

[1] 
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1455cf8dbfd06aa7651dcfccbadb7a093944ca65
[2] https://github.com/systemd/systemd/issues/7587
[3] https://bugs.debian.org/883425
[4] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=883425#68

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