linux-kernel - Re: [PATCH V3] nvmem: brcm_nvram: store a copy of NVRAM content

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Message-ID: <7cb70a8ead5f6b74f0a287ac8832873c@milecki.pl>
Date:   Fri, 08 Dec 2023 12:25:07 +0100
From:   Rafał Miłecki <rafal@...ecki.pl>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc:     Rafał Miłecki <zajec5@...il.com>,
        linux-mtd@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Arınç ÜNAL <arinc.unal@...nc9.com>,
        Florian Fainelli <florian.fainelli@...adcom.com>,
        Scott Branden <scott.branden@...adcom.com>
Subject: Re: [PATCH V3] nvmem: brcm_nvram: store a copy of NVRAM content

On 2023-12-08 12:15, Srinivas Kandagatla wrote:
> Thank you for the patch,
> 
> On 02/11/2023 06:28, Rafał Miłecki wrote:
>> From: Rafał Miłecki <rafal@...ecki.pl>
>> 
>> This driver uses MMIO access for reading NVRAM from a flash device.
>> Underneath there is a flash controller that reads data and provides
>> mapping window.
>> 
>> Using MMIO interface affects controller configuration and may break 
>> real
>> controller driver. It was reported by multiple users of devices with
>> NVRAM stored on NAND.
>> 
>> Modify driver to read & cache NVRAM content during init and use that
>> copy to provide NVMEM data when requested. On NAND flashes due to 
>> their
>> alignment NVRAM partitions can be quite big (1 MiB and more) while
>> actual NVRAM content stays quite small (usually 16 to 32 KiB). To 
>> avoid
>> allocating so much memory check for actual data length.
>> 
>> Link: 
>> https://lore.kernel.org/linux-mtd/CACna6rwf3_9QVjYcM+847biTX=K0EoWXuXcSMkJO1Vy_5vmVqA@mail.gmail.com/
>> Fixes: 3fef9ed0627a ("nvmem: brcm_nvram: new driver exposing 
>> Broadcom's NVRAM")
> 
> Any reason not to add
> Cc: <Stable@...r.kernel.org>
> ?

Not really. I believe stable team would pick this fix anyway (thanks to
the Fixes:) but doing
Cc: stable@...r.kernel.org
is described as strongly preferred.

Do you think you can just ammend my patch while applying it and add
Cc: stable@...r.kernel.org
to it?

-- 
Rafał Miłecki