linux-kernel - Re: [PATCH v3] mtd: Verify written data in paranoid mode

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Message-ID: <328640247.29680292.1747043114691.JavaMail.zimbra@nod.at>
Date: Mon, 12 May 2025 11:45:14 +0200 (CEST)
From: Richard Weinberger <richard@....at>
To: Miquel Raynal <miquel.raynal@...tlin.com>
Cc: Csókás Bence <csokas.bence@...lan.hu>, 
	linux-mtd <linux-mtd@...ts.infradead.org>, 
	linux-kernel <linux-kernel@...r.kernel.org>, 
	Vignesh Raghavendra <vigneshr@...com>
Subject: Re: [PATCH v3] mtd: Verify written data in paranoid mode

----- Ursprüngliche Mail -----
> Von: "Miquel Raynal" <miquel.raynal@...tlin.com>
>> +config MTD_PARANOID
>> +	bool "Read back written data (paranoid mode)"
>> +	help
>> +	  This option makes the MTD core read back all data on a write and
>> +	  report an error if it doesn't match the written data. This can
>> +	  safeguard against silent bit errors resulting from a faulty Flash,
>> +	  controller oddities, bus noise etc.
>> +
>> +	  It is up to the layer above MTD (e.g. the filesystem) to handle
>> +	  this condition, for example by going read-only to prevent further
>> +	  data corruption, or to mark a certain region of Flash as bad.
>> +
>> +	  If you are unsure, select 'n'.

I still have a hard time seeing the benefit of this.
To me it looks like you're working around broken hardware.

Thanks,
//richard