linux-kernel - Re: [PATCH 2/2] ARM: dts: imx7: add USDHC NAND clock to SDHC instances

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <CAOMZO5DOib3PfCOQ-yqKAJnKRJZ2eBnMJnA84y=sv+vsYdbbBQ@mail.gmail.com>
Date:   Tue, 11 Apr 2017 20:23:19 -0300
From:   Fabio Estevam <festevam@...il.com>
To:     Dong Aisheng <dongas86@...il.com>
Cc:     Stefan Agner <stefan@...er.ch>, Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <kernel@...gutronix.de>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Dong Aisheng <aisheng.dong@....com>,
        Fabio Estevam <fabio.estevam@....com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        linux-clk@...r.kernel.org,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] ARM: dts: imx7: add USDHC NAND clock to SDHC instances

On Mon, Apr 10, 2017 at 11:59 PM, Dong Aisheng <dongas86@...il.com> wrote:

> This is caused by ahb_root_clk gets disabled accidently and system hangs.
>
> Because this patch defines ipg_root_clk earlier before its parent
> (ahb_root_clk) got registered, then it will be marked as a orphan clk
> temporarily. Until the parent ahb_root_clk got registered, the clk core
> will reparent it to the newly found parent. (see __clk_core_init() function).
>
> Due to CLK_SET_RATE_PARENT flag, the ahb clk will be enabled during
> set_parent operation and then disabled after that.
> Then system hang cause we still get no chance to run init_on clks.
>
> I just send out a proper fix patch with correct register sequence.

Excellent, thanks!