linux-kernel - Re: [PATCH v1 1/1] media: ipu3-cio2: Fix referece counting when looping over ACPI devices

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Message-ID: <20210421140340.GD3@paasikivi.fi.intel.com>
Date:   Wed, 21 Apr 2021 17:03:40 +0300
From:   Sakari Ailus <sakari.ailus@...ux.intel.com>
To:     Andy Shevchenko <andy.shevchenko@...il.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>
Subject: Re: [PATCH v1 1/1] media: ipu3-cio2: Fix referece counting when
 looping over ACPI devices

Hi Andy,

Thanks for the patch.

On Sun, Apr 04, 2021 at 09:14:09PM +0300, Andy Shevchenko wrote:
> When we continue, due to device is disabled, loop we have to drop reference count.
> When we have an array full of devices we have to also drop the reference count.
> Note, in this case the cio2_bridge_unregister_sensors() is called by the caller.

Please limit the commit message to 75 chars, at least if there's no reason
to do otherwise.

I can wrap it this time.

> 
> Fixes: 803abec64ef9 ("media: ipu3-cio2: Add cio2-bridge to ipu3-cio2 driver")
> Cc: Daniel Scally <djrscally@...il.com>
> Cc: Sakari Ailus <sakari.ailus@...ux.intel.com>
> Signed-off-by: Andy Shevchenko <andy.shevchenko@...il.com>
> ---
>  drivers/media/pci/intel/ipu3/cio2-bridge.c | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/media/pci/intel/ipu3/cio2-bridge.c b/drivers/media/pci/intel/ipu3/cio2-bridge.c
> index c2199042d3db..85f8b587405e 100644
> --- a/drivers/media/pci/intel/ipu3/cio2-bridge.c
> +++ b/drivers/media/pci/intel/ipu3/cio2-bridge.c
> @@ -173,14 +173,15 @@ static int cio2_bridge_connect_sensor(const struct cio2_sensor_config *cfg,
>  	int ret;
>  
>  	for_each_acpi_dev_match(adev, cfg->hid, NULL, -1) {
> -		if (!adev->status.enabled)
> +		if (!adev->status.enabled) {
> +			acpi_dev_put(adev);
>  			continue;
> +		}
>  
>  		if (bridge->n_sensors >= CIO2_NUM_PORTS) {
> +			acpi_dev_put(adev);
>  			dev_err(&cio2->dev, "Exceeded available CIO2 ports\n");
> -			cio2_bridge_unregister_sensors(bridge);
> -			ret = -EINVAL;
> -			goto err_out;
> +			return -EINVAL;
>  		}
>  
>  		sensor = &bridge->sensors[bridge->n_sensors];
> @@ -228,7 +229,6 @@ static int cio2_bridge_connect_sensor(const struct cio2_sensor_config *cfg,
>  	software_node_unregister_nodes(sensor->swnodes);
>  err_put_adev:
>  	acpi_dev_put(sensor->adev);
> -err_out:
>  	return ret;
>  }
>  

-- 
Regards,

Sakari Ailus