linux-kernel - Re: [PATCH v2] mtd: core: always verify OOB offset in mtd_check_oob

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Message-ID: <87frct9jd0.fsf@bootlin.com>
Date: Thu, 11 Sep 2025 16:03:39 +0200
From: Miquel Raynal <miquel.raynal@...tlin.com>
To: Gabor Juhos <j4g8y7@...il.com>
Cc: Santhosh Kumar K <s-k6@...com>,  Richard Weinberger <richard@....at>,
  Vignesh Raghavendra <vigneshr@...com>,  linux-mtd@...ts.infradead.org,
  linux-kernel@...r.kernel.org,  stable@...r.kernel.org,  Daniel Golle
 <daniel@...rotopia.org>
Subject: Re: [PATCH v2] mtd: core: always verify OOB offset in
 mtd_check_oob_ops()

Hello,

>>>> Applied to mtd/next, thanks!
>>>> [1/1] mtd: core: always verify OOB offset in mtd_check_oob_ops()
>>>>        commit: bf7d0543b2602be5cb450d8ec5a8710787806f88
>>>
>>> I'm seeing a failure in SPI NOR flashes due to this patch:
>>> (Tested on AM62x SK with S28HS512T OSPI NOR flash)
>
> Sorry for the inconvenience.
>
>> Gabor, can you check what happens with mtdblock?
>
> The strange thing is that it works with (SPI) NAND flashes:
>
> # cat /sys/class/mtd/mtd0/type
> nand
> # cat /sys/class/mtd/mtd0/oobavail
> 0
> #
> # hexdump -n 2048 /dev/mtd0

This is not mtdblock, the report was using mtdblock, not mtd directly. I
don't know if that actually makes a difference, but it is worth the try.

Santhosh, please send a revert for now.

Thanks,
Miquèl