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

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Date:	Tue, 14 Sep 2010 09:36:23 +0200
From:	Lothar Waßmann <LW@...O-electronics.de>
To:	Jonathan Cameron <arm@...23.retrosnub.co.uk>
Cc:	Joe Perches <joe@...ches.com>,
	Linus Walleij <linus.walleij@...ricsson.com>,
	linux-kernel@...r.kernel.org, linux-i2c@...r.kernel.org,
	"Ben Dooks \(embedded platforms\)" <ben-linux@...ff.org>,
	"Jean Delvare \(PC drivers\, core\)" <khali@...ux-fr.org>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 05/25] drivers/i2c: Use static const char arrays

Hi,

Jonathan Cameron writes:
>  Commit message is  somewhat inaccurate...
> 
> On 09/13/10 20:47, 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);
> I'm guessing that there are never more than a couple of these.
> Why is this method a better bet than just putting %d?
>
'%c' will only ever produce one byte of output while '%d' may
produce up to 11 bytes depending on the value of bus_nr thus
overflowing the buffer.


Lothar Waßmann
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