linux-kernel - Re: [PATCH 4/8]drivers:tmp.c Fix warning: variable 'rc' set but not used

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Date:	Mon, 14 Jun 2010 19:12:31 -0700
From:	"Justin P. Mattock" <justinmattock@...il.com>
To:	Valdis.Kletnieks@...edu
CC:	linux-kernel@...r.kernel.org, reiserfs-devel@...r.kernel.org,
	linux-bluetooth@...r.kernel.org, clemens@...isch.de,
	debora@...ux.vnet.ibm.com, dri-devel@...ts.freedesktop.org,
	linux-i2c@...r.kernel.org, linux1394-devel@...ts.sourceforge.net,
	linux-media@...r.kernel.org
Subject: Re: [PATCH 4/8]drivers:tmp.c Fix warning: variable 'rc' set but not
 used

On 06/14/2010 05:13 PM, Valdis.Kletnieks@...edu wrote:
> On Mon, 14 Jun 2010 13:26:44 PDT, "Justin P. Mattock" said:
>> Im getting this warning when compiling:
>>   CC      drivers/char/tpm/tpm.o
>> drivers/char/tpm/tpm.c: In function 'tpm_gen_interrupt':
>> drivers/char/tpm/tpm.c:508:10: warning: variable 'rc' set but not used
>>
>> The below patch gets rid of the warning,
>> but I'm not sure if it's the best solution.
>
>>   	rc = transmit_cmd(chip,&tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
>>   			"attempting to determine the timeouts");
>> +	if (!rc)
>> +		rc = 0;
>>   }
>
> Good thing that's a void function. ;)
>
> Unless transmit_cmd() is marked 'must_check', maybe losing the 'rc =' would
> be a better solution?


what I tried was this:

if (!rc)
	printk("test........"\n")

and everything looked good,
but as a soon as I changed

rc = transmit_cmd(chip,&tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
    			"attempting to determine the timeouts");

to this:

rc = transmit_cmd(chip,&tpm_cmd, TPM_INTERNAL_RESULT_SIZE);

if (!rc)
	printk("attempting to determine the timeouts\n");

I error out with transmit_cmd not having enough
functions to it.. so I just added the rc = 0;
and went on to the next.

Justin P. Mattock
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