linux-kernel - Re: [PATCH v1] driver core: Release all resources during unbind before updating device links

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Message-ID: <CAGETcx8uB6i2jt_9gvhcbzARNhy_r-byZxvdLp=mTywFEHNDbQ@mail.gmail.com>
Date:   Wed, 18 Oct 2023 15:25:59 -0700
From:   Saravana Kannan <saravanak@...gle.com>
To:     Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Yang Yingliang <yangyingliang@...wei.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Mark Brown <broonie@...nel.org>,
        Matti Vaittinen <mazziesaccount@...il.com>,
        James Clark <james.clark@....com>, kernel-team@...roid.com,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] driver core: Release all resources during unbind
 before updating device links

On Wed, Oct 18, 2023 at 3:40 AM Uwe Kleine-König
<u.kleine-koenig@...gutronix.de> wrote:
>
> On Tue, Oct 17, 2023 at 06:38:50PM -0700, Saravana Kannan wrote:
> > This commit fixes a bug in commit 9ed9895370ae ("driver core: Functional
> > dependencies tracking support") where the device link status was
> > incorrectly updated in the driver unbind path before all the device's
> > resources were released.
> >
> > Fixes: 9ed9895370ae ("driver core: Functional dependencies tracking support")
> > Reported-by: "Uwe Kleine-König" <u.kleine-koenig@...gutronix.de>
> > Closes: https://lore.kernel.org/all/20231014161721.f4iqyroddkcyoefo@pengutronix.de/
> > Signed-off-by: Saravana Kannan <saravanak@...gle.com>
> > Cc: Thierry Reding <thierry.reding@...il.com>
> > Cc: Yang Yingliang <yangyingliang@...wei.com>
> > Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> > Cc: Mark Brown <broonie@...nel.org>
> > Cc: Matti Vaittinen <mazziesaccount@...il.com>
> > Cc: James Clark <james.clark@....com>
> > ---
> >  drivers/base/dd.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/base/dd.c b/drivers/base/dd.c
> > index a528cec24264..0c3725c3eefa 100644
> > --- a/drivers/base/dd.c
> > +++ b/drivers/base/dd.c
> > @@ -1274,8 +1274,8 @@ static void __device_release_driver(struct device *dev, struct device *parent)
> >               if (dev->bus && dev->bus->dma_cleanup)
> >                       dev->bus->dma_cleanup(dev);
> >
> > -             device_links_driver_cleanup(dev);
> >               device_unbind_cleanup(dev);
> > +             device_links_driver_cleanup(dev);
>
> Tested-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
> Acked-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
>
> This indeed fixes the crash I experinced before.

Thanks for the Tested-by!

-Saravana