linux-kernel - Re: [linux-sunxi] [PATCH 2/4] drivers: soc: sunxi: fix error processing on base address when claiming

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Message-ID: <CAGb2v67F6xUOE9sJsBgpOn2kRoG2S-aoWrtTsjON64o2pzeXjA@mail.gmail.com>
Date:   Fri, 18 Aug 2017 14:21:07 +0800
From:   Chen-Yu Tsai <wens@...e.org>
To:     Icenowy Zheng <icenowy@...c.io>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Chen-Yu Tsai <wens@...e.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-sunxi <linux-sunxi@...glegroups.com>
Subject: Re: [linux-sunxi] [PATCH 2/4] drivers: soc: sunxi: fix error
 processing on base address when claiming

Hi,

On Wed, Aug 9, 2017 at 4:56 PM, Icenowy Zheng <icenowy@...c.io> wrote:
> When claiming SRAM, if the base is set to an error, it means that the
> SRAM controller has been probed, but failed to remap the controller
> memory zone. If the base is zero, thus the SRAM controller should be not
> probed at all, and it should return -EPROBE_DEFER. However, currently we
> returned -EPROBE_DEFER in the former situation, and ignored the latter
> situation (which will lead to the kernel to panic).
>
> Fix the behavior on abnormal base address processing when claiming.

Could you describe how you actually ran into this? The failure seems
unlikely for a properly written device tree.

Thanks
ChenYu