linux-kernel - Re: [PATCH v2 09/61] mmc: sdhci-pic32: Convert to platform remove callback returning void

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Message-ID: <c82f2143-05f2-c5fb-8d34-858f10fd4977@vivo.com>
Date:   Wed, 26 Jul 2023 14:40:26 +0800
From:   Yangtao Li <frank.li@...o.com>
To:     Adrian Hunter <adrian.hunter@...el.com>,
        Ulf Hansson <ulf.hansson@...aro.org>
Cc:     Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
        linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 09/61] mmc: sdhci-pic32: Convert to platform remove
 callback returning void

On 2023/7/26 14:20, Adrian Hunter wrote:

> On 26/07/23 06:59, Yangtao Li wrote:
>> The .remove() callback for a platform driver returns an int which makes
>> many driver authors wrongly assume it's possible to do error handling by
>> returning an error code. However the value returned is (mostly) ignored
>> and this typically results in resource leaks. To improve here there is a
>> quest to make the remove callback return void. In the first step of this
>> quest all drivers are converted to .remove_new() which already returns
>> void.
>>
>> Trivially convert this driver from always returning zero in the remove
>> callback to the void returning variant.
>>
>> Cc: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
>> Signed-off-by: Yangtao Li <frank.li@...o.com>
> I already acked a number of patches:
>
> https://lore.kernel.org/linux-mmc/af01d060-dbaa-aa54-8203-3da5fcbc0a79@intel.com/
>
> Also there do not seem to be any changelogs?


Why do I remember adding these just now, even though it was not sent out 
in the end. . .

Ulf, do I need to resend v3?


Thx,

Yangtao


>
>> ---
>>   drivers/mmc/host/sdhci-pic32.c | 6 ++----
>>   1 file changed, 2 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/mmc/host/sdhci-pic32.c b/drivers/mmc/host/sdhci-pic32.c
>> index 6696b6bdd88e..7a0351a9c74e 100644
>> --- a/drivers/mmc/host/sdhci-pic32.c
>> +++ b/drivers/mmc/host/sdhci-pic32.c
>> @@ -210,7 +210,7 @@ static int pic32_sdhci_probe(struct platform_device *pdev)
>>   	return ret;
>>   }
>>   
>> -static int pic32_sdhci_remove(struct platform_device *pdev)
>> +static void pic32_sdhci_remove(struct platform_device *pdev)
>>   {
>>   	struct sdhci_host *host = platform_get_drvdata(pdev);
>>   	struct pic32_sdhci_priv *sdhci_pdata = sdhci_priv(host);
>> @@ -221,8 +221,6 @@ static int pic32_sdhci_remove(struct platform_device *pdev)
>>   	clk_disable_unprepare(sdhci_pdata->base_clk);
>>   	clk_disable_unprepare(sdhci_pdata->sys_clk);
>>   	sdhci_pltfm_free(pdev);
>> -
>> -	return 0;
>>   }
>>   
>>   static const struct of_device_id pic32_sdhci_id_table[] = {
>> @@ -238,7 +236,7 @@ static struct platform_driver pic32_sdhci_driver = {
>>   		.of_match_table = of_match_ptr(pic32_sdhci_id_table),
>>   	},
>>   	.probe		= pic32_sdhci_probe,
>> -	.remove		= pic32_sdhci_remove,
>> +	.remove_new	= pic32_sdhci_remove,
>>   };
>>   
>>   module_platform_driver(pic32_sdhci_driver);