linux-kernel - Re: [PATCH 5/5]scsi:hosts.c Fix warning: variable 'rval' set but not used

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Date:	Fri, 18 Jun 2010 12:55:39 -0700
From:	"Justin P. Mattock" <justinmattock@...il.com>
To:	James Bottomley <James.Bottomley@...e.de>
CC:	linux-kernel@...r.kernel.org, linux-wireless@...r.kernel.org,
	linux-pci@...r.kernel.org, linux-scsi@...r.kernel.org
Subject: Re: [PATCH 5/5]scsi:hosts.c Fix warning: variable 'rval' set but
 not used

On 06/18/2010 12:37 PM, James Bottomley wrote:
> On Thu, 2010-06-17 at 09:16 -0700, Justin P. Mattock wrote:
>>> Erm, well, as I said, error code and the fact that the thread failed to
>>> start, so more
>>>
>>> printk(KERN_WARNING "scsi%d: error handler thread failed to spawn, error
>>> = %d\n", host->host_no, PTR_ERR(shost->ehandler));
>>>
>>> James
>>>
>>
>> o.k. I looked at this a bit more and finally got the thing to build
>> through without a warning, using what you had sent, but keep in mind I
>> still need to add error  = %d\n", host->host_no, to the printk
>>
>> here's what I have so far:
>>
>>
>>    drivers/scsi/hosts.c |    3 ++-
>>    1 files changed, 2 insertions(+), 1 deletions(-)
>>
>> diff --git a/drivers/scsi/hosts.c b/drivers/scsi/hosts.c
>> index 6660fa9..c1ff708 100644
>> --- a/drivers/scsi/hosts.c
>> +++ b/drivers/scsi/hosts.c
>> @@ -419,8 +419,9 @@ struct Scsi_Host *scsi_host_alloc(struct
>> scsi_host_template *sht, int privsize)
>>
>>    	shost->ehandler = kthread_run(scsi_error_handler, shost,
>>    			"scsi_eh_%d", shost->host_no);
>> +	rval = PTR_ERR(shost->ehandler);
>>    	if (IS_ERR(shost->ehandler)) {
>> -		rval = PTR_ERR(shost->ehandler);
>> +		printk(KERN_WARNING "scsi%d: error handler thread failed to spawn\n",
>> rval);
>
> So this isn't really an improvement over the suggestion.  What you
> wanted was shost->host_no, as you deduced, but the %d becomes %ld to
> quiet the type warning.
>
> James

ahh.. was reading the manual but couldn't make sense of the % then 
letter to use.

let me add these in, then if good I'll send it out for review etc..

Justin P. Mattock
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