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

[Arnd Bergmann]

On Mon, Aug 14, 2017 at 7:35 AM, Shawn Guo <shawnguo@xxxxxxxxxx> wrote:
> On Sun, Aug 13, 2017 at 10:12:13PM -0700, Stefan Agner wrote:
>> Hi Shawn,
>>
>> On 2017-08-04 20:13, Shawn Guo wrote:
>> > 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@xxxxxxx>
>> >> Cc: Andrey Smirnov <andrew.smirnov@xxxxxxxxx>
>> >> Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
>> >> Cc: linux-kernel@xxxxxxxxxxxxxxx
>> >> Fixes: 03aa12629fc4 ("soc: imx: Add GPCv2 power gating driver")
>> >> Signed-off-by: Stefan Agner <stefan@xxxxxxxx>
>> >
>> > Applied, thanks.
>>
>> As of 4.13-rc5 this did not make it upstream yet, I guess still on its
>> way?
>
> Yes, Stefan. It's on the way to arm-soc [1], but not yet responded.
>
> Shawn
>
> [1] https://www.spinics.net/lists/arm-kernel/msg598634.html

Merged into arm-soc now with Shawn's pull request.

      Arnd