linux-kernel - Re: [rtc-linux] [PATCH 2/2] Allow to override the hctosys RTC using a kernel parameter

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Date:	Tue, 15 Jul 2014 16:15:59 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	rtc-linux@...glegroups.com
Cc:	Roman Fietze <roman.fietze@...emotive.de>,
	linux-kernel@...r.kernel.org,
	Alessandro Zummo <a.zummo@...ertech.it>
Subject: Re: [rtc-linux] [PATCH 2/2] Allow to override the hctosys RTC using
 a kernel parameter

On Mon, 07 Jul 2014 13:50:12 +0200 Roman Fietze <roman.fietze@...emotive.de> wrote:

> This change allows to overwrite the default of the hctosys RTC
> specified in the kernnel configuration by using a kernel parameter in
> the form of
> 
>   hctosys=rtc<n>
> 

Seems reasonable to me, but...

> +char rtc_hctosys_device[RTC_HCTOSYS_DEVICE_SIZE] = CONFIG_RTC_HCTOSYS_DEVICE;
> +
> +static int __init parse_hctosys(char *str)
> +{
> +	if (!str)
> +		return -EINVAL;
> +
> +	if (strlen(str) >= RTC_HCTOSYS_DEVICE_SIZE)
> +		return -ENOMEM;
> +
> +	strcpy(rtc_hctosys_device, str);

Can we just strdup() this thing and do away with all this futzing around
with the maximum string length?

> +	return 0;
> +}

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