linux-kernel - Re: [PATCH 2/2] PCI: iproc: avoid maybe-uninitialized warning

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Date:   Tue, 22 Nov 2016 09:45:24 -0800
From:   Ray Jui <ray.jui@...adcom.com>
To:     Arnd Bergmann <arnd@...db.de>, Bjorn Helgaas <bhelgaas@...gle.com>
Cc:     Ray Jui <rjui@...adcom.com>, Scott Branden <sbranden@...adcom.com>,
        Jon Mason <jonmason@...adcom.com>,
        bcm-kernel-feedback-list@...adcom.com,
        Oza Oza <oza.oza@...adcom.com>,
        "Dmitry V. Krivenok" <krivenok.dmitry@...il.com>,
        linux-pci@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] PCI: iproc: avoid maybe-uninitialized warning

Hi Arnd,

On 11/22/2016 6:17 AM, Arnd Bergmann wrote:
> gcc notices that calling iproc_pcie_setup_ib with ib->nr_regions==0
> would result in an uninitialized return value:
> 
> drivers/pci/host/pcie-iproc.c: In function 'iproc_pcie_setup_ib':
> drivers/pci/host/pcie-iproc.c:894:6: error: 'ret' may be used uninitialized in this function [-Werror=maybe-uninitialized]
> 
> This can't really happen, but the correct behavior of the function
> is probably to return -EINVAL if it ever did.
> 
> Fixes: 4213e15c364e ("PCI: iproc: Make outbound mapping code more generic")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  drivers/pci/host/pcie-iproc.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/pci/host/pcie-iproc.c b/drivers/pci/host/pcie-iproc.c
> index 857ff5198317..0359569c8d78 100644
> --- a/drivers/pci/host/pcie-iproc.c
> +++ b/drivers/pci/host/pcie-iproc.c
> @@ -936,6 +936,7 @@ static int iproc_pcie_setup_ib(struct iproc_pcie *pcie,
>  
>  		}
>  	}
> +	ret = -EINVAL;
>  err_ib:
>  	dev_err(dev, "unable to configure inbound mapping\n");
>  	dev_err(dev, "axi %pap, pci %pap, res size %pap\n",
> 

This change is good, but in my opinion, a further improvement for
clarity would be to initialize 'ret' to -EINVAL in the beginning of this
function when 'ret' is declared. What do you think?

Thanks,

Ray