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

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Date:	Wed, 16 Jun 2010 19:25:43 +0200
From:	Rolf Eike Beer <eike-kernel@...tec.de>
To:	"Justin P. Mattock" <justinmattock@...il.com>
Cc:	James Bottomley <James.Bottomley@...e.de>,
	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

Justin P. Mattock wrote:
> On 06/16/2010 08:34 AM, James Bottomley wrote:

> > 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.

> 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:

> 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;
>   	}

If you want to print anything here I think the error code would be a good 
thing to include as that could give a hint _what_ actually went wrong. In that 
case you would need rval, but IMHO it should be declared inside that if 
clause.

Eike

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