linux-kernel - Re: [PATCH v2] PCI: imx6: Limit DBI register length for imx6qp PCIe

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Date:   Mon, 21 Jun 2021 15:24:14 +0100
From:   Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:     Richard Zhu <hongxing.zhu@....com>
Cc:     l.stach@...gutronix.de, kw@...ux.com, bhelgaas@...gle.com,
        stefan@...er.ch, linux-pci@...r.kernel.org, linux-imx@....com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kernel@...gutronix.de
Subject: Re: [PATCH v2] PCI: imx6: Limit DBI register length for imx6qp PCIe

On Sat, Feb 20, 2021 at 10:49:48AM +0800, Richard Zhu wrote:
> Define the length of the DBI registers and limit config space to its
> length. This makes sure that the kernel does not access registers beyond
> that point that otherwise would lead to an abort on the i.MX 6QuadPlus.
> 
> See commit 075af61c19cd ("PCI: imx6: Limit DBI register length") that
> resolves a similar issue on the i.MX 6Quad PCIe.
> 
> Signed-off-by: Richard Zhu <hongxing.zhu@....com>
> Reviewed-by: Lucas Stach <l.stach@...gutronix.de>
> Reviewed-by: Krzysztof Wilczyński <kw@...ux.com>
> ---
>  drivers/pci/controller/dwc/pci-imx6.c | 1 +
>  1 file changed, 1 insertion(+)

I'd like to merge this patch since I believe it is still required,
please let me know if that's not the case.

Lorenzo

> diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
> index 0cf1333c0440..853ea8e82952 100644
> --- a/drivers/pci/controller/dwc/pci-imx6.c
> +++ b/drivers/pci/controller/dwc/pci-imx6.c
> @@ -1175,6 +1175,7 @@ static const struct imx6_pcie_drvdata drvdata[] = {
>  		.variant = IMX6QP,
>  		.flags = IMX6_PCIE_FLAG_IMX6_PHY |
>  			 IMX6_PCIE_FLAG_IMX6_SPEED_CHANGE,
> +		.dbi_length = 0x200,
>  	},
>  	[IMX7D] = {
>  		.variant = IMX7D,
> -- 
> 2.17.1
>