linux-kernel - Re: [PATCH] advansys: fix build warning for PCI=n

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Date:   Tue, 25 Oct 2016 07:57:21 +0200
From:   Hannes Reinecke <hare@...e.com>
To:     Arnd Bergmann <arnd@...db.de>,
        "James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Cc:     Jens Axboe <axboe@...nel.dk>, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] advansys: fix build warning for PCI=n

On 10/24/2016 05:51 PM, Arnd Bergmann wrote:
> The advansys probe function tries to handle both ISA and PCI cases,
> each hidden in an #ifdef when unused. This leads to a warning
> indicating that when PCI is disabled we could be using uninitialized
> data:
> 
> drivers/scsi/advansys.c: In function ‘advansys_board_found’:
> drivers/scsi/advansys.c:11036:5: error: ‘ret’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
> drivers/scsi/advansys.c:10928:28: note: ‘ret’ was declared here
> drivers/scsi/advansys.c:11309:8: error: ‘share_irq’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
> drivers/scsi/advansys.c:10928:6: note: ‘share_irq’ was declared here
> 
> This cannot happen in practice because the hardware in question
> only exists for PCI, but changing the code to just error out
> here is better for consistency and avoids the warning.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  drivers/scsi/advansys.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/scsi/advansys.c b/drivers/scsi/advansys.c
> index febbd83e2ecd..81dd0927246b 100644
> --- a/drivers/scsi/advansys.c
> +++ b/drivers/scsi/advansys.c
> @@ -11030,6 +11030,9 @@ static int advansys_board_found(struct Scsi_Host *shost, unsigned int iop,
>  		ASC_DBG(2, "AdvInitGetConfig()\n");
>  
>  		ret = AdvInitGetConfig(pdev, shost) ? -ENODEV : 0;
> +#else
> +		share_irq = 0;
> +		ret = -ENODEV;
>  #endif /* CONFIG_PCI */
>  	}
>  
> 
Reviewed-by: Hannes Reinecke <hare@...e.com>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		               zSeries & Storage
hare@...e.com			               +49 911 74053 688
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
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