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Message-ID: <baceb44d-0d58-4410-b662-ad2830869db1@wanadoo.fr>
Date: Wed, 1 Nov 2023 08:48:48 +0100
From: Christophe JAILLET <christophe.jaillet@...adoo.fr>
To: Stanley Chang[昌育德]
<stanley_chang@...ltek.com>
Cc: "Thinh.Nguyen@...opsys.com" <Thinh.Nguyen@...opsys.com>,
"conor+dt@...nel.org" <conor+dt@...nel.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
"krzysztof.kozlowski+dt@...aro.org"
<krzysztof.kozlowski+dt@...aro.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
"robh+dt@...nel.org" <robh+dt@...nel.org>
Subject: Re: RE: [PATCH v6 1/2] usb: dwc3: add Realtek DHC RTD SoC dwc3 glue
layer driver
Le 01/11/2023 à 07:27, Stanley Chang[昌育德] a écrit :
> Hi CJ,
>
> I think these functions are not needed in remove function.
>
> In dwc3_rtk_probe_dwc3_core,
> I have used
> dwc3_node = of_get_compatible_child(node, "snps,dwc3");
> and
> dwc3_pdev = of_find_device_by_node(dwc3_node);
>
> So, I call these put functions.
> platform_device_put(dwc3_pdev);
> of_node_put(dwc3_node);
Yes, but you call it only in the error handling path of the function.
I wonder if they should also be called in the remove function in order
to decrement the ref-counted reference.
Same in __get_dwc3_maximum_speed(), the reference taken by:
dwc3_np = of_get_compatible_child(np, "snps,dwc3");
is never released.
See the comment at [1] to see what I mean.
[1]: https://elixir.bootlin.com/linux/v6.6/source/drivers/of/base.c#L681
CJ
>
> Thanks,
> Stanley
>
>> Hi,
>>
>> Is something like
>> platform_device_put(dwc3_pdev);
>> of_node_put(dwc3_node);
>> needed in the remove function?
>>
>> (as done in the error handling path of dwc3_rtk_probe_dwc3_core())
>>
>> Or should it be added at the end of dwc3_rtk_probe_dwc3_core() if the
>> reference are nor needed anymore when we leave the function?
>>
>> CJ
>>
>>> + of_platform_depopulate(rtk->dev); }
>>> +
>>
>> ...
>
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