linux-kernel - Re: [PATCH v3 00/23] counter: cleanups and device lifetime fixes

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Message-ID: <20211230145826.7f23becb@jic23-huawei>
Date:   Thu, 30 Dec 2021 14:58:26 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
Cc:     William Breathitt Gray <vilhelm.gray@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Kamel Bouhara <kamel.bouhara@...tlin.com>,
        Ahmad Fatoum <a.fatoum@...gutronix.de>,
        David Lechner <david@...hnology.com>,
        Jonathan Corbet <corbet@....net>, linux-iio@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Oleksij Rempel <linux@...pel-privat.de>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Fabrice Gasnier <fabrice.gasnier@...s.st.com>,
        Jarkko Nikula <jarkko.nikula@...ux.intel.com>,
        linux-arm-kernel@...ts.infradead.org, kernel@...gutronix.de,
        Patrick Havelange <patrick.havelange@...ensium.com>,
        Syed Nayyar Waris <syednwaris@...il.com>,
        linux-stm32@...md-mailman.stormreply.com,
        Maxime Coquelin <mcoquelin.stm32@...il.com>
Subject: Re: [PATCH v3 00/23] counter: cleanups and device lifetime fixes

On Thu, 30 Dec 2021 09:53:51 +0100
Uwe Kleine-König <u.kleine-koenig@...gutronix.de> wrote:

> Hello,
> 
> On Wed, Dec 29, 2021 at 04:44:18PM +0100, Uwe Kleine-König wrote:
> > this is v3 of my series to fix device lifetime issues in the counter
> > framework. This hopefully addresses all things pointed out for v2.
> > 
> > Note this depends on 60f07e74f86b (which is in next) now. Full diffstat
> > below.
> > 
> > Things that could be further improved:
> > 
> > [...]
> > 
> > Uwe Kleine-König (23):
> >   counter: Use container_of instead of drvdata to track counter_device
> >   counter: ftm-quaddec: Drop unused platform_set_drvdata()
> >   counter: microchip-tcb-capture: Drop unused platform_set_drvdata()
> >   counter: Provide a wrapper to access device private data
> >   counter: 104-quad-8: Convert to counter_priv() wrapper
> >   counter: interrupt-cnt: Convert to counter_priv() wrapper
> >   counter: microchip-tcb-capture: Convert to counter_priv() wrapper
> >   counter: intel-qep: Convert to counter_priv() wrapper
> >   counter: ftm-quaddec: Convert to counter_priv() wrapper
> >   counter: ti-eqep: Convert to counter_priv() wrapper
> >   counter: stm32-lptimer-cnt: Convert to counter_priv() wrapper
> >   counter: stm32-timer-cnt: Convert to counter_priv() wrapper
> >   counter: Provide alternative counter registration functions
> >   counter: Update documentation for new counter registration functions
> >   counter: 104-quad-8: Convert to new counter registration
> >   counter: interrupt-cnt: Convert to new counter registration
> >   counter: intel-qep: Convert to new counter registration
> >   counter: ftm-quaddec: Convert to new counter registration
> >   counter: microchip-tcb-capture: Convert to new counter registration
> >   counter: stm32-timer-cnt: Convert to new counter registration
> >   counter: stm32-lptimer-cnt: Convert to new counter registration
> >   counter: ti-eqep: Convert to new counter registration
> >   counter: remove old and now unused registration API
> > 
> >  Documentation/driver-api/generic-counter.rst |  10 +-
> >  drivers/counter/104-quad-8.c                 |  93 +++++-----
> >  drivers/counter/counter-core.c               | 186 ++++++++++++++-----
> >  drivers/counter/ftm-quaddec.c                |  36 ++--
> >  drivers/counter/intel-qep.c                  |  46 ++---
> >  drivers/counter/interrupt-cnt.c              |  38 ++--
> >  drivers/counter/microchip-tcb-capture.c      |  44 ++---
> >  drivers/counter/stm32-lptimer-cnt.c          |  51 ++---
> >  drivers/counter/stm32-timer-cnt.c            |  48 ++---
> >  drivers/counter/ti-eqep.c                    |  31 ++--
> >  include/linux/counter.h                      |  15 +-
> >  11 files changed, 356 insertions(+), 242 deletions(-)
> > 
> > Range-diff against v2:
> > [...]
> > 
> > base-commit: a7904a538933c525096ca2ccde1e60d0ee62c08e
> > prerequisite-patch-id: 9459ad8bc78190558df9123f8bebe28ca1c396ea  
> 
> All patches have a blessing by at least one of William and Jonathan.

For future reference (may be fine this time) William has final say on counter
stuff as the maintainer so treat my input as just another set of eyes.

Anyhow, plenty of time for any necessary fixes during the RCs so shouldn't
be a problem.

Jonathan


> The prerequisite commit (60f07e74f86b) is in Greg's char-misc-next branch.
> 
> Assuming noone still finds a problem in this series that requires me to
> respin I wonder who will pick it up? Greg?
> 
> Given that it fixes a possible use-after-free in all counter drivers,
> I'd like to see it hit before v5.17-rc1. For 5.16 it's probably too
> late.
> 
> Best regards
> Uwe
>