linux-kernel - Re: [PATCH v1] usb: dwc3: add device put function to decrement the ref-counted reference

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Date:   Fri, 10 Nov 2023 02:34:22 +0000
From:   Thinh Nguyen <Thinh.Nguyen@...opsys.com>
To:     Stanley Chang <stanley_chang@...ltek.com>
CC:     Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1] usb: dwc3: add device put function to decrement the
 ref-counted reference

On Tue, Nov 07, 2023, Stanley Chang wrote:
> When the function exits, the count should be decremented via
> platform_device_put and of_node_put.
> 
> Fixes: 34c200483569 ("usb: dwc3: add Realtek DHC RTD SoC dwc3 glue layer driver")
> Signed-off-by: Stanley Chang <stanley_chang@...ltek.com>
> ---
>  drivers/usb/dwc3/dwc3-rtk.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/usb/dwc3/dwc3-rtk.c b/drivers/usb/dwc3/dwc3-rtk.c
> index 590028e8fdcb..9d6f2a8bd6ce 100644
> --- a/drivers/usb/dwc3/dwc3-rtk.c
> +++ b/drivers/usb/dwc3/dwc3-rtk.c
> @@ -187,6 +187,7 @@ static enum usb_device_speed __get_dwc3_maximum_speed(struct device_node *np)
>  
>  	ret = match_string(speed_names, ARRAY_SIZE(speed_names), maximum_speed);
>  
> +	of_node_put(dwc3_np);
>  	return (ret < 0) ? USB_SPEED_UNKNOWN : ret;
>  }
>  
> @@ -339,6 +340,8 @@ static int dwc3_rtk_probe_dwc3_core(struct dwc3_rtk *rtk)
>  
>  	switch_usb2_role(rtk, rtk->cur_role);
>  
> +	platform_device_put(dwc3_pdev);

Don't you use this after probe? Why put here and not on remove?

BR,
Thinh

> +	of_node_put(dwc3_node);
>  	return 0;
>  
>  err_pdev_put:
> -- 
> 2.34.1
>