linux-kernel - Re: [PATCH v3 1/3] usb: ulpi: Move of_node_put to ulpi_dev

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Date:   Mon, 31 Jan 2022 13:07:13 +0200
From:   Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:     Sean Anderson <sean.anderson@...o.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/3] usb: ulpi: Move of_node_put to ulpi_dev_release

On Thu, Jan 27, 2022 at 02:00:02PM -0500, Sean Anderson wrote:
> Drivers are not unbound from the device when ulpi_unregister_interface
> is called. Move of_node-freeing code to ulpi_dev_release which is called
> only after all users are gone.
> 
> Fixes: ef6a7bcfb01c ("usb: ulpi: Support device discovery via DT")
> Signed-off-by: Sean Anderson <sean.anderson@...o.com>

Reviewed-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>

> ---
> 
> Changes in v3:
> - Use separate patch for moving of_node_put from unregister to release
> 
>  drivers/usb/common/ulpi.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/common/ulpi.c b/drivers/usb/common/ulpi.c
> index 4169cf40a03b..c90a1ab705a3 100644
> --- a/drivers/usb/common/ulpi.c
> +++ b/drivers/usb/common/ulpi.c
> @@ -127,6 +127,7 @@ static const struct attribute_group *ulpi_dev_attr_groups[] = {
>  
>  static void ulpi_dev_release(struct device *dev)
>  {
> +	of_node_put(dev->of_node);
>  	kfree(to_ulpi_dev(dev));
>  }
>  
> @@ -296,7 +297,6 @@ EXPORT_SYMBOL_GPL(ulpi_register_interface);
>   */
>  void ulpi_unregister_interface(struct ulpi *ulpi)
>  {
> -	of_node_put(ulpi->dev.of_node);
>  	device_unregister(&ulpi->dev);
>  }
>  EXPORT_SYMBOL_GPL(ulpi_unregister_interface);
> -- 
> 2.25.1

thanks,

-- 
heikki