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x-smime-chain=info body.smime-part=TEXT x-smime-chain-identifier=null (COMODO RSA Client Authentication and Secure Email CA) x-smime-chain-serial=6a9be1383bff2b6b9f01d5d9b8a75256 x-smime-chain-issuer="C=GB,CN=COMODO RSA Certification Authority,L=Salford,O=COMODO CA Limited,S=Greater Manchester" x-smime-chain-valid-from="2013-01-09 19:00:00" x-smime-chain-valid-to="2028-01-09 18:59:59" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754039AbeCGWL2 (ORCPT ); Wed, 7 Mar 2018 17:11:28 -0500 Received: from twosheds.infradead.org ([90.155.92.209]:58346 "EHLO twosheds.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754052AbeCGWL1 (ORCPT ); Wed, 7 Mar 2018 17:11:27 -0500 Message-ID: <1520460673.31298.136.camel@infradead.org> Subject: Re: [PATCH] ubi: Reject MLC NAND From: David Woodhouse To: Steve deRosier , Pavel Machek Cc: Richard Weinberger , Boris Brezillon , dedekind1@gmail.com, tharvey@gateworks.com, linux-kernel@vger.kernel.org, stable@vger.kernel.org, marek.vasut@gmail.com, linux-mtd@lists.infradead.org, cyrille.pitchen@wedev4u.fr, computersforpeace@gmail.com In-Reply-To: References: <20180303104554.5958-1-richard@nod.at> <20180306231805.GA28183@amd> <6772577.AmT7QaWTNU@blindfold> <20180307214342.GA9852@amd> Face: 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 Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-stWl8nqBuo+7lkwCOO4y" Date: Wed, 07 Mar 2018 22:11:13 +0000 Mime-Version: 1.0 X-Mailer: Evolution 3.18.5.2-0ubuntu3.2 X-SRS-Rewrite: SMTP reverse-path rewritten from by twosheds.infradead.org. See http://www.infradead.org/rpr.html Sender: stable-owner@vger.kernel.org X-Mailing-List: stable@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: --=-stWl8nqBuo+7lkwCOO4y Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2018-03-07 at 14:08 -0800, Steve deRosier wrote: >=20 > To clarify one thing: the reason for this is MLC has actually never > been supported, nor worked properly. The fact that it kinda worked was > incidental and the cause of major problems for people due to that not > being clear. This patch only makes it explicit and avoids people > mistakenly trying to use UBIFS on MLC flash and risking their data and > products. To me, that's what's important. >=20 > This is an important patch, even if all it does is keep people from > loosing data. It also changes the conversation from "I have a > corrupted UBIFS device, BTW it's on MLC..." to "What can we do to get > UBIFS to work on MLC". This is a bug fix. UBI on MLC never worked. It was a bug that we ever permitted it. This is now fixed. Actually making UBI on MLC *work* would be a feature, and wouldn't be backported to stable. But this one is *absolutely* appropriate for a stable backport. --=-stWl8nqBuo+7lkwCOO4y Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEFQw ggUxMIIEGaADAgECAhBNRhEyk/HZ7naOeTHWrzuAMA0GCSqGSIb3DQEBCwUAMIGXMQswCQYDVQQG EwJHQjEbMBkGA1UECBMSR3JlYXRlciBNYW5jaGVzdGVyMRAwDgYDVQQHEwdTYWxmb3JkMRowGAYD VQQKExFDT01PRE8gQ0EgTGltaXRlZDE9MDsGA1UEAxM0Q09NT0RPIFJTQSBDbGllbnQgQXV0aGVu dGljYXRpb24gYW5kIFNlY3VyZSBFbWFpbCBDQTAeFw0xNzEyMjEwMDAwMDBaFw0xODEyMjEyMzU5 NTlaMCQxIjAgBgkqhkiG9w0BCQEWE2R3bXcyQGluZnJhZGVhZC5vcmcwggEiMA0GCSqGSIb3DQEB AQUAA4IBDwAwggEKAoIBAQDgzLNWa18DNpGUj/ZeH0Sgz53ESIbzdPw3OJeuNP6jZhxZojbyfxbM hETscxI/Hj6UZ4a7sHm5BkVjlsB1Af2Za/PXUt8MmLAcPMHkMPGunvkUibEvblDvpqMkQZlaZM+t 5PqFmWkbehLaEvbpNY7dmEAAeKh4klTzJzrr5AAzaCQ32cA2e3+DEIv5O5l9ViMIjy/JM+xMQrfX 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