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Date:   Thu, 5 Mar 2020 05:47:34 -0500 (EST)
From:   Vladis Dronov <vdronov@redhat.com>
To:     Andrea Righi <andrea.righi@canonical.com>
Cc:     Richard Cochran <richardcochran@gmail.com>,
        "David S. Miller" <davem@davemloft.net>, netdev@vger.kernel.org,
        linux-kernel@vger.kernel.org
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Subject: Re: [PATCH] ptp: free ptp clock properly
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Hello, Andrea, all,

> > I would guess that a kernel in question (5.3.0-40-generic) has the commit
> > a33121e5487b but does not have the commit 75718584cb3c, which should be
> > exactly fixing a docking station disconnect crash. Could you please,
> > check this?
> 
> Unfortunately the kernel in question already has 75718584cb3c:
> https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/bionic/commit/?h=hwe&id=c71b774732f997ef38ed7bd62e73891a01f2bbfe
> 
> It looks like there's something else that can free up too early the
> resources required by posix_clock_unregister() to destroy the related
> sysfs files.
> 
> Maybe what we really need to call from ptp_clock_release() is
> pps_unregister_source()? Something like this:

Err... I believe, "Maybe" is not a good enough reason to accept a kernel patch.
Probably, there should be something supporting this statement.

Best regards,
Vladis Dronov | Red Hat, Inc. | The Core Kernel | Senior Software Engineer