linux-kernel - Re: [PATCH] PCI: aardvark: Indicate error in 'val' when config read fails

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Date:   Fri, 19 Jun 2020 12:56:18 +0200
From:   Pali Rohár <pali@...nel.org>
To:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Bjorn Helgaas <helgaas@...nel.org>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Rob Herring <robh@...nel.org>,
        Andrew Murray <amurray@...goodpenguin.co.uk>,
        Marek Behún <marek.behun@....cz>,
        Remi Pommarel <repk@...plefau.lt>,
        Tomasz Maciej Nowak <tmn505@...il.com>,
        Xogium <contact@...ium.me>
Cc:     linux-pci@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PCI: aardvark: Indicate error in 'val' when config read
 fails

Hello Lorenzo! Could you please review this patch?

On Monday 01 June 2020 15:03:15 Pali Rohár wrote:
> Most callers of config read do not check for return value. But most of the
> ones that do, checks for error indication in 'val' variable.
> 
> This patch updates error handling in advk_pcie_rd_conf() function. If PIO
> transfer fails then 'val' variable is set to 0xffffffff which indicates
> failture.
> 
> Signed-off-by: Pali Rohár <pali@...nel.org>

I should add credit for Bjorn as he found this issue

Reported-by: Bjorn Helgaas <helgaas@...nel.org>

> ---
>  drivers/pci/controller/pci-aardvark.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c
> index 53a4cfd7d377..783a7f1f2c44 100644
> --- a/drivers/pci/controller/pci-aardvark.c
> +++ b/drivers/pci/controller/pci-aardvark.c
> @@ -691,8 +691,10 @@ static int advk_pcie_rd_conf(struct pci_bus *bus, u32 devfn,
>  	advk_writel(pcie, 1, PIO_START);
>  
>  	ret = advk_pcie_wait_pio(pcie);
> -	if (ret < 0)
> +	if (ret < 0) {
> +		*val = 0xffffffff;
>  		return PCIBIOS_SET_FAILED;
> +	}
>  
>  	advk_pcie_check_pio_status(pcie);
>  
> -- 
> 2.20.1
>