netdev - Re: [PATCH v2] ptp: free ptp clock properly

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Message-ID: <1493646639.21012930.1586253909001.JavaMail.zimbra@redhat.com>
Date:   Tue, 7 Apr 2020 06:05:09 -0400 (EDT)
From:   Vladis Dronov <vdronov@...hat.com>
To:     Andrea Righi <andrea.righi@...onical.com>
Cc:     Piotr Morgwai Kotarbiński <morgwai@...gwai.pl>,
        Colin Ian King <colin.king@...onical.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] ptp: free ptp clock properly

Hello,

----- Original Message -----
> From: "Andrea Righi" <andrea.righi@...onical.com>
> To: "Vladis Dronov" <vdronov@...hat.com>
> Cc: "Piotr Morgwai Kotarbiński" <morgwai@...gwai.pl>, "Colin Ian King" <colin.king@...onical.com>, "Richard Cochran"
> <richardcochran@...il.com>, "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
> linux-kernel@...r.kernel.org
> Sent: Tuesday, April 7, 2020 11:34:22 AM
> Subject: Re: [PATCH v2] ptp: free ptp clock properly
> 
> On Fri, Apr 03, 2020 at 09:34:14AM -0400, Vladis Dronov wrote:
> > Hello, Andrea, Colin, all,
> > 
> > This fix is really not needed, as its creation is based on the assumption
> > that the Ubuntu kernel 5.3.0-40-generic has the upstream commit
> > 75718584cb3c,
> > which is the real fix to this crash.
> > 
> > > > > 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
> > 
> > Apologies, but the assumption above is not correct, 5.3.0-40-generic does
> > not have 75718584cb3c. If it had 75718584cb3c it would be a fix and the
> > ptp-related
> > crash (described in https://bugs.launchpad.net/bugs/1864754) would not
> > happen.
> > 
> > This way
> > https://lists.ubuntu.com/archives/kernel-team/2020-March/108562.html fix
> > is not really needed.
> 
> Hi Vladis,
> 
> for the records, I repeated the tests with a lot of help from the bug
> reporter (Morgwai, added in cc), this time making sure we were using the
> same kernels.
> 
> I confirm that my fix is not really needed as you correctly pointed out.
> Thanks for looking into this and sorry for the noise! :)

Hei, great! Thank you for updating. I'm happy this situation has resolved
properly!

> 
> -Andrea
> 

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