linux-kernel - Re: [PATCH 05/25] drivers/i2c: Use static const char arrays

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Message-ID: <20100914232313.GC7494@trinity.fluff.org>
Date:	Wed, 15 Sep 2010 00:23:13 +0100
From:	Ben Dooks <ben-i2c@...ff.org>
To:	Joe Perches <joe@...ches.com>
Cc:	linux-kernel@...r.kernel.org,
	Linus Walleij <linus.walleij@...ricsson.com>,
	"Jean Delvare (PC drivers, core)" <khali@...ux-fr.org>,
	"Ben Dooks (embedded platforms)" <ben-linux@...ff.org>,
	linux-arm-kernel@...ts.infradead.org, linux-i2c@...r.kernel.org
Subject: Re: [PATCH 05/25] drivers/i2c: Use static const char arrays

On Mon, Sep 13, 2010 at 12:47:43PM -0700, Joe Perches wrote:
> Signed-off-by: Joe Perches <joe@...ches.com>
> ---
>  drivers/i2c/busses/i2c-stu300.c |    4 ++--
>  1 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/i2c/busses/i2c-stu300.c b/drivers/i2c/busses/i2c-stu300.c
> index 495be45..2f7c09c 100644
> --- a/drivers/i2c/busses/i2c-stu300.c
> +++ b/drivers/i2c/busses/i2c-stu300.c
> @@ -871,7 +871,7 @@ stu300_probe(struct platform_device *pdev)
>  	struct resource *res;
>  	int bus_nr;
>  	int ret = 0;
> -	char clk_name[] = "I2C0";
> +	char clk_name[sizeof("I2Cx")];
>  
>  	dev = kzalloc(sizeof(struct stu300_dev), GFP_KERNEL);
>  	if (!dev) {
> @@ -881,7 +881,7 @@ stu300_probe(struct platform_device *pdev)
>  	}
>  
>  	bus_nr = pdev->id;
> -	clk_name[3] += (char)bus_nr;
> +	sprintf(clk_name, "I2C%c", '0' + bus_nr);
>  	dev->clk = clk_get(&pdev->dev, clk_name);
>  	if (IS_ERR(dev->clk)) {
>  		ret = PTR_ERR(dev->clk);

personally, i'd prefer to see snprintf() used, to ensure that this sort
of thing never goes wrong if people decde to change the string. It is
a pitty there's no good way of temporarily allocating data an having it
freed in C.

As such, apologies to Russell about the abuse of the clk_get() call, but
let's not fix that just now.

-- 
Ben

Q:      What's a light-year?
A:      One-third less calories than a regular year.

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