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

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

[Saravana Kannan]

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@pengutronix.de>
Closes: https://lore.kernel.org/all/20231014161721.f4iqyroddkcyoefo@pengutronix.de/
Signed-off-by: Saravana Kannan <saravanak@google.com>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: Yang Yingliang <yangyingliang@huawei.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Mark Brown <broonie@kernel.org>
Cc: Matti Vaittinen <mazziesaccount@gmail.com>
Cc: James Clark <james.clark@arm.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);
 
 		klist_remove(&dev->p->knode_driver);
 		device_pm_check_callbacks(dev);
-- 
2.42.0.655.g421f12c284-goog

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

[Rafael J. Wysocki]

On Wed, Oct 18, 2023 at 3:38 AM Saravana Kannan <saravanak@google.com> 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@pengutronix.de>
> Closes: https://lore.kernel.org/all/20231014161721.f4iqyroddkcyoefo@pengutronix.de/
> Signed-off-by: Saravana Kannan <saravanak@google.com>
> Cc: Thierry Reding <thierry.reding@gmail.com>
> Cc: Yang Yingliang <yangyingliang@huawei.com>
> Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> Cc: Mark Brown <broonie@kernel.org>
> Cc: Matti Vaittinen <mazziesaccount@gmail.com>
> Cc: James Clark <james.clark@arm.com>

Acked-by: Rafael J. Wysocki <rafael@kernel.org>

> ---
>  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);
>
>                 klist_remove(&dev->p->knode_driver);
>                 device_pm_check_callbacks(dev);
> --
> 2.42.0.655.g421f12c284-goog
>

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

[Uwe Kleine-König]

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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@pengutronix.de>
> Closes: https://lore.kernel.org/all/20231014161721.f4iqyroddkcyoefo@pengutronix.de/
> Signed-off-by: Saravana Kannan <saravanak@google.com>
> Cc: Thierry Reding <thierry.reding@gmail.com>
> Cc: Yang Yingliang <yangyingliang@huawei.com>
> Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> Cc: Mark Brown <broonie@kernel.org>
> Cc: Matti Vaittinen <mazziesaccount@gmail.com>
> Cc: James Clark <james.clark@arm.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@pengutronix.de>
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>

This indeed fixes the crash I experinced before.

Thanks a lot!
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |

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

[Saravana Kannan]

On Wed, Oct 18, 2023 at 3:40 AM Uwe Kleine-König
<u.kleine-koenig@pengutronix.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@pengutronix.de>
> > Closes: https://lore.kernel.org/all/20231014161721.f4iqyroddkcyoefo@pengutronix.de/
> > Signed-off-by: Saravana Kannan <saravanak@google.com>
> > Cc: Thierry Reding <thierry.reding@gmail.com>
> > Cc: Yang Yingliang <yangyingliang@huawei.com>
> > Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> > Cc: Mark Brown <broonie@kernel.org>
> > Cc: Matti Vaittinen <mazziesaccount@gmail.com>
> > Cc: James Clark <james.clark@arm.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@pengutronix.de>
> Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
>
> This indeed fixes the crash I experinced before.

Thanks for the Tested-by!

-Saravana

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

[Greg Kroah-Hartman]

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@pengutronix.de>
> Closes: https://lore.kernel.org/all/20231014161721.f4iqyroddkcyoefo@pengutronix.de/
> Signed-off-by: Saravana Kannan <saravanak@google.com>
> Cc: Thierry Reding <thierry.reding@gmail.com>
> Cc: Yang Yingliang <yangyingliang@huawei.com>
> Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> Cc: Mark Brown <broonie@kernel.org>
> Cc: Matti Vaittinen <mazziesaccount@gmail.com>
> Cc: James Clark <james.clark@arm.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);
>  
>  		klist_remove(&dev->p->knode_driver);
>  		device_pm_check_callbacks(dev);
> -- 
> 2.42.0.655.g421f12c284-goog
> 

Hi,

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