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

[Shawn Guo]

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>
> ---
> 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