linux-kernel - Re: [PATCH v2 3/3] PCI: imx6: limit DBI register length

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Date:   Tue, 27 Nov 2018 23:12:03 -0200
From:   Fabio Estevam <festevam@...il.com>
To:     Andrey Smirnov <andrew.smirnov@...il.com>
Cc:     Stefan Agner <stefan@...er.ch>, Jingoo Han <jingoohan1@...il.com>,
        Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
        Lucas Stach <l.stach@...gutronix.de>,
        Trent Piepho <tpiepho@...inj.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Leonard Crestez <leonard.crestez@....com>
Subject: Re: [PATCH v2 3/3] PCI: imx6: limit DBI register length

Hi Andrey,

On Tue, Nov 27, 2018 at 10:57 PM Andrey Smirnov
<andrew.smirnov@...il.com> wrote:

> Could this be a regression? Prior to 415b6185c541 ("PCI: imx6: Fix
> config read timeout handling") all of the imprecise aborts were caught
> and handled via no-op handler. I did an experiment on i.MX6Q board
> that I have (ZII RDU2) and adding a simple no-op for imprecise aborts
> via
>
> hook_fault_code(16 + 6, imx6q_pcie_no_op_handler, SIGBUS, 0,
>                        "imprecise external abort");
>
> seems to "resolve" this problem:

Please check https://patchwork.kernel.org/patch/9720313/

This commit fixed a kernel crash on mx6q boards with a PCI switch.

So we can't go back to the simple no-op.