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

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Message-ID: <22ee8cb0-5793-6ad6-d8e0-3e83a8c1361c@molgen.mpg.de>
Date:   Fri, 6 Apr 2018 15:24:39 +0200
From:   Paul Menzel <pmenzel+linux-input@...gen.mpg.de>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Michael Tokarev <mjt@....msk.ru>, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Ben Caradoc-Davies <ben@...nsient.nz>,
        it+linux-input@...gen.mpg.de
Subject: Re: Commit *driver core: emit uevents when device is bound to a
 driver* causes regression

Dear Greg,


On 04/06/18 15:18, Greg Kroah-Hartman wrote:
> On Fri, Apr 06, 2018 at 02:20:40PM +0200, Paul Menzel wrote:

>> 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?
> 
> I thought we fixed this with follow-on patches, are you sure you are
> using the latest 4.14.y kernel that has been released?

Here we are using Linux 4.14.30. We can try newer versions next week.


Kind regards,

Paul


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