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

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Message-ID: <ZU9bPMHqz7Gj4rHj@hovoldconsulting.com>
Date:   Sat, 11 Nov 2023 11:45:16 +0100
From:   Johan Hovold <johan@...nel.org>
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-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 at 05:12:51PM +0800, Stanley Chang wrote:
> When the function exits, the count should be decremented via
> platform_device_put and of_node_put.

This isn't really a self-contained commit message (and your use of
'count' is too vague). You're also changing two functions in two
different ways here.

> 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);

You're still leaking a reference in the of_property_read_string() error
path just above.

>  	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);
> +	of_node_put(dwc3_node);

Please keep the new line before return for readability.

>  	return 0;
>  
>  err_pdev_put:

Johan