linux-kernel - Re: [PATCH 09/19] mfd/twl4030: don't warn about uninitialized return code

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Date:	Fri, 25 Jan 2013 15:25:03 +0100
From:	Peter Ujfalusi <peter.ujfalusi@...com>
To:	Arnd Bergmann <arnd@...db.de>
CC:	<linux-arm-kernel@...t.infradead.org>,
	<linux-kernel@...r.kernel.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Kevin Hilman <khilman@...prootsystems.com>,
	Amit Kucheria <amit.kucheria@...aro.org>,
	"Kristo, Tero" <t-kristo@...com>
Subject: Re: [PATCH 09/19] mfd/twl4030: don't warn about uninitialized return
 code

On 01/25/2013 03:14 PM, Arnd Bergmann wrote:
> If the twl4030_write_script function gets called with
> a zero length argument, its return value does not
> get set. We know that all scripts have a nonzero
> length, but returning an error in case they ever
> do is probably appropriate.
> 
> Without this patch, building omap2plus_defconfig results in:
> 
> drivers/mfd/twl4030-power.c: In function 'load_twl4030_script':
> drivers/mfd/twl4030-power.c:414:5: error: 'err' may be used uninitialized in this function

I've fixed up Kevin's email since he is no longer with TI and added Tero to
the CC list since this is *something*-power on OMAP platforms ;)

Reviewed-by: Peter Ujfalusi <peter.ujfalusi@...com>

> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> Cc: Samuel Ortiz <sameo@...ux.intel.com>
> Cc: Peter Ujfalusi <peter.ujfalusi@...com>
> Cc: Kevin Hilman <khilman@...com>
> Cc: Amit Kucheria <amit.kucheria@...aro.org>
> ---
>  drivers/mfd/twl4030-power.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/mfd/twl4030-power.c b/drivers/mfd/twl4030-power.c
> index 4dae241..dd362c1 100644
> --- a/drivers/mfd/twl4030-power.c
> +++ b/drivers/mfd/twl4030-power.c
> @@ -159,7 +159,7 @@ out:
>  static int twl4030_write_script(u8 address, struct twl4030_ins *script,
>  				       int len)
>  {
> -	int err;
> +	int err = -EINVAL;
>  
>  	for (; len; len--, address++, script++) {
>  		if (len == 1) {
> 


-- 
Péter
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