linux-kernel - Re: [PATCH v2 1/1] media: ipu3-cio2: Drop reference on error path in cio2_bridge_connect

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Date:   Thu, 26 Aug 2021 18:56:18 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Daniel Scally <djrscally@...il.com>,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Yong Zhi <yong.zhi@...el.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Bingbu Cao <bingbu.cao@...el.com>,
        Tianshu Qiu <tian.shu.qiu@...el.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Jens Axboe <axboe@...nel.dk>
Subject: Re: [PATCH v2 1/1] media: ipu3-cio2: Drop reference on error path in cio2_bridge_connect_sensor()

On Thu, Aug 26, 2021 at 12:53 PM Andy Shevchenko
<andriy.shevchenko@...ux.intel.com> wrote:
>
> The commit 71f642833284 ("ACPI: utils: Fix reference counting in
> for_each_acpi_dev_match()") moved adev assignment outside of error
> path and hence made acpi_dev_put(sensor->adev) a no-op. We still
> need to drop reference count on error path, and to achieve that,
> replace sensor->adev by locally assigned adev.
>
> Fixes: 71f642833284 ("ACPI: utils: Fix reference counting in for_each_acpi_dev_match()")
> Depends-on: fc68f42aa737 ("ACPI: fix NULL pointer dereference")
> Reported-by: Jens Axboe <axboe@...nel.dk>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Acked-by: Sakari Ailus <sakari.ailus@...ux.intel.com>
> ---
> v2: added tag (Sakari), Cc'ed to Rafael to pick up (would be nice to push it to v5.14)
>  drivers/media/pci/intel/ipu3/cio2-bridge.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/media/pci/intel/ipu3/cio2-bridge.c b/drivers/media/pci/intel/ipu3/cio2-bridge.c
> index 59a36f922675..30d29b96a339 100644
> --- a/drivers/media/pci/intel/ipu3/cio2-bridge.c
> +++ b/drivers/media/pci/intel/ipu3/cio2-bridge.c
> @@ -226,7 +226,7 @@ static int cio2_bridge_connect_sensor(const struct cio2_sensor_config *cfg,
>  err_free_swnodes:
>         software_node_unregister_nodes(sensor->swnodes);
>  err_put_adev:
> -       acpi_dev_put(sensor->adev);
> +       acpi_dev_put(adev);
>         return ret;
>  }
>
> --

Applied as 5.14-rc material, thanks!