linux-kernel - Re: [PATCH v1 1/1] media: ipu3-cio2: Drop reference on error path in cio2_bridge_connect

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Message-ID: <20210726114433.GB3@paasikivi.fi.intel.com>
Date:   Mon, 26 Jul 2021 14:44:33 +0300
From:   Sakari Ailus <sakari.ailus@...ux.intel.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Daniel Scally <djrscally@...il.com>, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org, Yong Zhi <yong.zhi@...el.com>,
        Bingbu Cao <bingbu.cao@...el.com>,
        Tianshu Qiu <tian.shu.qiu@...el.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Jens Axboe <axboe@...nel.dk>
Subject: Re: [PATCH v1 1/1] media: ipu3-cio2: Drop reference on error path in
 cio2_bridge_connect_sensor()

Hi Andy,

On Mon, Jul 26, 2021 at 11:40:55AM +0300, Andy Shevchenko 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>
> ---
>  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);

adev is assigned to sensor->adev before goto so the two have the same
value. I have no problem with the patch though.

>  	return ret;
>  }
>  

-- 
Regards,

Sakari Ailus