linux-kernel - Re: [PATCH] soc: imx: gpcv2: fix regulator deferred probe

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

Message-ID: <20170803025017.GJ31819@dragon>
Date:   Thu, 3 Aug 2017 10:50:18 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     Stefan Agner <stefan@...er.ch>
Cc:     kernel@...gutronix.de, Fabio Estevam <fabio.estevam@....com>,
        Andrey Smirnov <andrew.smirnov@...il.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] soc: imx: gpcv2: fix regulator deferred probe

On Wed, Aug 02, 2017 at 12:51:29PM -0700, Stefan Agner wrote:
> If a regulator requests a deferred probe, the power domain gets
> initialized twice. This leads to a list double add (without
> list debugging the kernel hangs due to the double add later):
> 
>   WARNING: CPU: 0 PID: 19 at lib/list_debug.c:31 __list_add_valid+0xbc/0xc4
>   list_add double add: new=c1229754, prev=c12383b4, next=c1229754.
> 
> Initialize the power domain after we get the regulator. Also do
> not print an error in case the regulator defers probing.
> 
> Cc: Fabio Estevam <fabio.estevam@....com>
> Cc: Andrey Smirnov <andrew.smirnov@...il.com>
> Cc: linux-arm-kernel@...ts.infradead.org
> Cc: linux-kernel@...r.kernel.org
> Fixes: 03aa12629fc4 ("soc: imx: Add GPCv2 power gating driver")
> Signed-off-by: Stefan Agner <stefan@...er.ch>
> ---
> Hi Shawn,
> 
> Since this leads to a Kernel hang in v4.13-rc3, can you get this
> into v4.13 still?

Sure.  But before doing that, I would like to get an ACK from Andrey on
this fix.

Shawn