linux-kernel - Re: [PATCH 1/1] i2c: at91: constify at91_twi

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Message-ID: <19b2d721-06a3-bc17-eb81-18ee2d8856a3@kernel.org>
Date:   Mon, 3 Jul 2023 20:23:30 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Andi Shyti <andi.shyti@...nel.org>,
        Michał Mirosław <mirq-linux@...e.qmqm.pl>
Cc:     Codrin Ciubotariu <codrin.ciubotariu@...rochip.com>,
        linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] i2c: at91: constify at91_twi_pdata

On 30/06/2023 00:38, Andi Shyti wrote:
> Hi Michal,
> 
> [...]
> 
>> -static struct at91_twi_pdata *at91_twi_get_driver_data(
>> +static const struct at91_twi_pdata *at91_twi_get_driver_data(
>>  					struct platform_device *pdev)
>>  {
>>  	if (pdev->dev.of_node) {
>> @@ -189,9 +189,9 @@ static struct at91_twi_pdata *at91_twi_get_driver_data(
>>  		match = of_match_node(atmel_twi_dt_ids, pdev->dev.of_node);
>>  		if (!match)
>>  			return NULL;
>> -		return (struct at91_twi_pdata *)match->data;
>> +		return match->data;
>>  	}
>> -	return (struct at91_twi_pdata *) platform_get_device_id(pdev)->driver_data;
>> +	return (const void *) platform_get_device_id(pdev)->driver_data;
> 
> the const's always confuse me... do you get an error here? Is
> this cast really needed?

I think this change is not necessary and actually should not matter. See
for example drivers/tty/serial/samsung_tty.c after my refactorings in
commit 3aec40096550 ("tty: serial: samsung: reduce number of casts").

Best regards,
Krzysztof