linux-kernel - Re: [PATCH] PCI: mediatek: Fix unchecked return value

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Date:   Wed, 5 Sep 2018 16:50:33 +0800
From:   Honghui Zhang <honghui.zhang@...iatek.com>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>
CC:     Ryder Lee <ryder.lee@...iatek.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        <linux-pci@...r.kernel.org>, <linux-mediatek@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] PCI: mediatek: Fix unchecked return value

On Fri, 2018-07-20 at 10:01 -0500, Gustavo A. R. Silva wrote:
> Check return value of devm_pci_remap_iospace.
> 
> Notice that, currently, all instances of devm_pci_remap_iospace
> are being checked.
> 
> Addresses-Coverity-ID: 1471965 ("Unchecked return value")
> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
> ---
>  drivers/pci/controller/pcie-mediatek.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 

Hi, Gustavo, thanks for your help.

Acked-by: Honghui Zhang <honghui.zhang@...iatek.com>

> diff --git a/drivers/pci/controller/pcie-mediatek.c b/drivers/pci/controller/pcie-mediatek.c
> index 861dda6..1477939 100644
> --- a/drivers/pci/controller/pcie-mediatek.c
> +++ b/drivers/pci/controller/pcie-mediatek.c
> @@ -1109,7 +1109,9 @@ static int mtk_pcie_request_resources(struct mtk_pcie *pcie)
>  	if (err < 0)
>  		return err;
>  
> -	devm_pci_remap_iospace(dev, &pcie->pio, pcie->io.start);
> +	err = devm_pci_remap_iospace(dev, &pcie->pio, pcie->io.start);
> +	if (err)
> +		return err;
>  
>  	return 0;
>  }