linux-kernel - Re: [PATCH 2/2] UBI: block: Implement kernel_param

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Message-ID: <53299AF5.5020607@nod.at>
Date:	Wed, 19 Mar 2014 14:26:13 +0100
From:	Richard Weinberger <richard@....at>
To:	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>
CC:	dedekind1@...il.com, dwmw2@...radead.org,
	computersforpeace@...il.com, linux-mtd@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] UBI: block: Implement kernel_param_ops->get()

Am 19.03.2014 14:15, schrieb Ezequiel Garcia:
> Hi Richard,
> 
> On Mar 19, Richard Weinberger wrote:
>> The ->get() function is not optional.
>>
> 
> [..]
>>  static struct kernel_param_ops ubiblock_param_ops = {
>>  	.set    = ubiblock_set_param,
>> +	.get	= param_get_charp,
>>  };
>>  module_param_cb(block, &ubiblock_param_ops, NULL, 0);
> 
> The comment for the function says they are both optional:
> 
> /**
>  * module_param_cb - general callback for a module/cmdline parameter
>  * @name: a valid C identifier which is the parameter name.
>  * @ops: the set & get operations for this parameter.
>  * @perm: visibility in sysfs.
>  *
>  * The ops can have NULL set or get functions.
>  */
> 
> This has no visibility in sysfs, so I can't see how having a NULL
> get() is a problem. What's the issue you're trying to fix here?
> 
> Maybe I'm missing something?
> 

BTW: I think we can omit ->get() as some other drivers also only have ->set().
Who want the credit for a documentation fix? ;)

Thanks,
//richard
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