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

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Message-ID: <4C18F524.4000902@gmail.com>
Date:	Wed, 16 Jun 2010 09:00:36 -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 06/16/2010 08:34 AM, James Bottomley wrote:
> On Tue, 2010-06-15 at 22:33 -0700, Justin P. Mattock wrote:
>> The below patch fixes a warning message generated by gcc 4.6.0
>>    CC      drivers/scsi/hosts.o
>> drivers/scsi/hosts.c: In function 'scsi_host_alloc':
>> drivers/scsi/hosts.c:328:6: warning: variable 'rval' set but not used
>>
>>   Signed-off-by: Justin P. Mattock<justinmattock@...il.com>
>>
>> ---
>>   drivers/scsi/hosts.c |    2 --
>>   1 files changed, 0 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/scsi/hosts.c b/drivers/scsi/hosts.c
>> index 6660fa9..00fd6a4 100644
>> --- a/drivers/scsi/hosts.c
>> +++ b/drivers/scsi/hosts.c
>> @@ -325,7 +325,6 @@ struct Scsi_Host *scsi_host_alloc(struct scsi_host_template *sht, int privsize)
>>   {
>>   	struct Scsi_Host *shost;
>>   	gfp_t gfp_mask = GFP_KERNEL;
>> -	int rval;
>>
>>   	if (sht->unchecked_isa_dma&&  privsize)
>>   		gfp_mask |= __GFP_DMA;
>> @@ -420,7 +419,6 @@ 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);
>>   	if (IS_ERR(shost->ehandler)) {
>> -		rval = PTR_ERR(shost->ehandler);
>>   		goto fail_kfree;
>>   	}
>
> For future reference, this is less stylistically acceptable C: you've
> reduced the if clause to a single statement, so the braces need
> removing.
>
> However, I don't think we should be ignoring the fact that the eh thread
> failed to spawn, so I think some type of printed warning (giving the
> error code) would be a much more appropriate replacement.
>
> James
>
>
>


o.k. I'll give a try at that.. as a  test I did this(below) seemed to 
compile clean, but not sure if this is what you're asking for though:


 From 8a4d6e793e0f92d180a6f48c53bbf00d2751ad01 Mon Sep 17 00:00:00 2001
From: Justin P. Mattock <justinmattock@...il.com>
Date: Wed, 16 Jun 2010 08:58:13 -0700
Subject: [PATCH] test
  Signed-off-by: Justin P. Mattock <justinmattock@...il.com>

---
  drivers/scsi/hosts.c |    3 +--
  1 files changed, 1 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/hosts.c b/drivers/scsi/hosts.c
index 6660fa9..8d98a46 100644
--- a/drivers/scsi/hosts.c
+++ b/drivers/scsi/hosts.c
@@ -325,7 +325,6 @@ struct Scsi_Host *scsi_host_alloc(struct 
scsi_host_template *sht, int privsize)
  {
  	struct Scsi_Host *shost;
  	gfp_t gfp_mask = GFP_KERNEL;
-	int rval;

  	if (sht->unchecked_isa_dma && privsize)
  		gfp_mask |= __GFP_DMA;
@@ -420,7 +419,7 @@ 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);
  	if (IS_ERR(shost->ehandler)) {
-		rval = PTR_ERR(shost->ehandler);
+		printk(KERN_WARNING "test.....\n");
  		goto fail_kfree;
  	}

-- 
1.7.1.rc1.21.gf3bd6



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