linux-kernel - Re: [PATCH 1/2] mfd: twl4030-power: do not allow negative or zero length script

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Date:	Tue, 20 Oct 2009 13:21:24 +0300
From:	Aaro Koskinen <aaro.koskinen@...ia.com>
To:	ext Samuel Ortiz <sameo@...ux.intel.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] mfd: twl4030-power: do not allow negative or zero
 length script

Hello,

Samuel Ortiz wrote:
> On Wed, Oct 14, 2009 at 03:15:49PM +0300, Aaro Koskinen wrote:
>> The script length cannot be negative. If the length is zero, return
>> an error.
>>
>> The patch eliminates the following compiler warning:
> Out of curiosity, which toolchain are you using ? I cross compile my mfd tree
> for ARM, and I dont get this error...

It seems I was accidentally using an older version of CodeSourcery
toolchain (2007q3-51). I tried now with the recent one and warnings
do not appear. I'm still not sure if they were totally bogus or not...

>> drivers/mfd/twl4030-power.c: In function 'twl4030_power_init':
> twl4030_power_init ? Isnt it twl4030_write_script ?

You are right, it seems the compiler does some inlining and
reports a wrong function name.

A.

> Cheers,
> Samuel.
> 
> 
>> drivers/mfd/twl4030-power.c:151: warning: 'err' may be used uninitialized in this function
>> drivers/mfd/twl4030-power.c:151: note: 'err' was declared here
>>
>> Signed-off-by: Aaro Koskinen <aaro.koskinen@...ia.com>
>> ---
>>  drivers/mfd/twl4030-power.c |    4 ++--
>>  1 files changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/mfd/twl4030-power.c b/drivers/mfd/twl4030-power.c
>> index d423e0c..eae6cda 100644
>> --- a/drivers/mfd/twl4030-power.c
>> +++ b/drivers/mfd/twl4030-power.c
>> @@ -146,9 +146,9 @@ out:
>>  }
>>  
>>  static int __init twl4030_write_script(u8 address, struct twl4030_ins *script,
>> -				       int len)
>> +				       unsigned len)
>>  {
>> -	int err;
>> +	int err = EINVAL;
>>  
>>  	for (; len; len--, address++, script++) {
>>  		if (len == 1) {
>> -- 
>> 1.6.0.4
>>
> 

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