From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from lithops.sigma-star.at (mailout.nod.at [116.203.167.152]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C961B25EFAA for ; Mon, 12 May 2025 09:51:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=116.203.167.152 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1747043499; cv=none; b=bs00YtfLfbNC36g0FFy1tHEJvpoP0PjVIltheytUei4qS0CefaZj0jotI+YEOzADeqyQNKCdIYA+KoNC0DxH/86GWAc5imo8v2QXlPOy55k3Gws+BrJITilocd1a4wGs/E6u9ILO+76MiE0qDEBz3iRM+KSnpve3H1gXDapyj4s= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1747043499; c=relaxed/simple; bh=S5shwbLrSs/BeHf8psSSdhDXYgSoCLJx7c3Xwp2Nrxs=; h=Date:From:To:Cc:Message-ID:In-Reply-To:References:Subject: MIME-Version:Content-Type; b=Yl2VcRjT+Brto4LdANG/QD0PaNN9foCGRQ43rEXvApVzrZCLvxdXVZmEr6inGgA3EdB+fq8CepzbFqaOTe0WEWfv3Ho0hiejDH5FU5jxHvOt5nK5yWSv1pos94kKL5wW17XdTAweprbAYFx5P9yNDjaqCqrPY0wxAHtagKpmL+o= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=nod.at; spf=fail smtp.mailfrom=nod.at; arc=none smtp.client-ip=116.203.167.152 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=nod.at Authentication-Results: smtp.subspace.kernel.org; spf=fail smtp.mailfrom=nod.at Received: from localhost (localhost [127.0.0.1]) by lithops.sigma-star.at (Postfix) with ESMTP id 5BEE5294730; Mon, 12 May 2025 11:45:15 +0200 (CEST) Received: from lithops.sigma-star.at ([127.0.0.1]) by localhost (lithops.sigma-star.at [127.0.0.1]) (amavisd-new, port 10032) with ESMTP id UIaDJ1vK0JpE; Mon, 12 May 2025 11:45:15 +0200 (CEST) Received: from localhost (localhost [127.0.0.1]) by lithops.sigma-star.at (Postfix) with ESMTP id 0AF27298563; Mon, 12 May 2025 11:45:15 +0200 (CEST) Received: from lithops.sigma-star.at ([127.0.0.1]) by localhost (lithops.sigma-star.at [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id NPwyG4Fo_tZg; Mon, 12 May 2025 11:45:14 +0200 (CEST) Received: from lithops.sigma-star.at (lithops.sigma-star.at [195.201.40.130]) by lithops.sigma-star.at (Postfix) with ESMTP id D73EE294730; Mon, 12 May 2025 11:45:14 +0200 (CEST) Date: Mon, 12 May 2025 11:45:14 +0200 (CEST) From: Richard Weinberger To: Miquel Raynal Cc: =?utf-8?B?Q3PDs2vDoXM=?= Bence , linux-mtd , linux-kernel , Vignesh Raghavendra Message-ID: <328640247.29680292.1747043114691.JavaMail.zimbra@nod.at> In-Reply-To: <87frhambri.fsf@bootlin.com> References: <20250512084033.69718-1-csokas.bence@prolan.hu> <87frhambri.fsf@bootlin.com> Subject: Re: [PATCH v3] mtd: Verify written data in paranoid mode Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Mailer: Zimbra 8.8.12_GA_3807 (ZimbraWebClient - FF138 (Linux)/8.8.12_GA_3809) Thread-Topic: Verify written data in paranoid mode Thread-Index: eln+2YgBQKlJyCVwub6wSu0FYk52RQ== ----- Urspr=C3=BCngliche Mail ----- > Von: "Miquel Raynal" >> +config MTD_PARANOID >> +=09bool "Read back written data (paranoid mode)" >> +=09help >> +=09 This option makes the MTD core read back all data on a write and >> +=09 report an error if it doesn't match the written data. This can >> +=09 safeguard against silent bit errors resulting from a faulty Flash, >> +=09 controller oddities, bus noise etc. >> + >> +=09 It is up to the layer above MTD (e.g. the filesystem) to handle >> +=09 this condition, for example by going read-only to prevent further >> +=09 data corruption, or to mark a certain region of Flash as bad. >> + >> +=09 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