linux-kernel - Re: [PATCH 2/2] PCI: imx6: limit DBI register length

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Message-ID: <ceb95fbdf0f6d0e0eeb1db3a22743f1453c8e060.camel@nxp.com>
Date:   Tue, 20 Nov 2018 10:22:56 +0000
From:   Leonard Crestez <leonard.crestez@....com>
To:     "stefan@...er.ch" <stefan@...er.ch>
CC:     Richard Zhu <hongxing.zhu@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "jingoohan1@...il.com" <jingoohan1@...il.com>,
        "gustavo.pimentel@...opsys.com" <gustavo.pimentel@...opsys.com>,
        "tpiepho@...inj.com" <tpiepho@...inj.com>,
        "andrew.smirnov@...il.com" <andrew.smirnov@...il.com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "l.stach@...gutronix.de" <l.stach@...gutronix.de>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>
Subject: Re: [PATCH 2/2] PCI: imx6: limit DBI register length

On Mon, 2018-11-19 at 10:41 +0100, Stefan Agner wrote:
> Define the length of the DBI registers. This makes sure that
> the kernel does not access registers beyond that point, avoiding
> the following abort on a i.MX 6Quad:
>   # cat /sys/devices/soc0/soc/1ffc000.pcie/pci0000\:00/0000\:00\:00.0/config
>   [  100.021433] Unhandled fault: imprecise external abort (0x1406) at 0xb6ea7000
>   ...
>   [  100.056423] PC is at dw_pcie_read+0x50/0x84
>   [  100.060790] LR is at dw_pcie_rd_own_conf+0x44/0x48
>   ...
> 
> Signed-off-by: Stefan Agner <stefan@...er.ch>
> 
> diff --git a/drivers/pci/controller/dwc/pci-imx6.c

> +struct imx6_pcie_drvdata {
> +	enum imx6_pcie_variants variant;
> +	int			dbi_length;
> +};

Turning imx6_pcie drvdata into a struct is very nice, maybe in the
future some of the long case statements in this driver could be split
into per-soc functions called via drvdata.