linux-kernel - Re: [PATCH] nvmem: rmem: Make reserved region name unique

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Date:   Wed, 12 Apr 2023 10:26:16 +0300
From:   "Ivan T. Ivanov" <iivanov@...e.de>
To:     Stefan Wahren <stefan.wahren@...e.com>
Cc:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Nicolas Saenz Julienne <nsaenz@...nel.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        linux-rpi-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] nvmem: rmem: Make reserved region name unique

Hi Stefan,

On 04-11 18:53, Stefan Wahren wrote:
> 
> Am 11.04.23 um 15:50 schrieb Ivan T. Ivanov:
> > They could be multiple reserved memory regions,
> > so let's make their names unique.
> > 
> > This fixes following kernel error:
> > 
> > [    9.831285] sysfs: cannot create duplicate filename '/bus/nvmem/devices/rmem0'
> 
> could you please provide more background information:
> 
> - are two instances of rmem trying to create this file?
> - which exact platform is affect (Raspberry Pi 4), because the Hardware name
> from the trace is useless?
> - could you provide some reliable scenario/config to reproduce this issue?

I was sure your will be asking. :-)

I am using RPi4[0] for testing this. Device tree is based on sources
from here [1]. From this devicetree it is  obvious what is happening.

Unfortunately right now SUSE Bugzilla is under maintenance, so perhaps you
can't see the bug report [2]. In brief I am using latest Tumbleweed on this
device and you can imagine that error is happening always.

Regards,
Ivan

[0] Raspberry Pi 4 Model B Rev 1.1
[1] https://github.com/raspberrypi/linux/blob/rpi-6.2.y/arch/arm/boot/dts/bcm2711-rpi.dtsi#L57
[2] https://bugzilla.suse.com/show_bug.cgi?id=1206846