From patchwork Thu May 20 09:18:37 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 444327 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D04BBC433ED for ; Thu, 20 May 2021 10:19:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B1C2D61074 for ; Thu, 20 May 2021 10:19:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235092AbhETKVK (ORCPT ); Thu, 20 May 2021 06:21:10 -0400 Received: from mail.kernel.org ([198.145.29.99]:51950 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235540AbhETKTP (ORCPT ); Thu, 20 May 2021 06:19:15 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 7E62C619B2; Thu, 20 May 2021 09:47:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1621504023; bh=utCbk+blntjf/cU7sZIjoED/DrtKfhd2Mvgji68r64w=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=nIr4h7HBkJLVavIdwREjEH7HEofELalVX+gmCy3NfC3TCgdEth0NWyEr0k113WLI7 vHP8jGntKbS33pRzDn0a+o+QqZHzQ1IQWOkdb3LV6qQUi6z+tvHpqP6KU5aUBs40QN gjDFfI6EdzUhZfz5MmpUxNW6zFdBf/v9ar4sE5CM= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Seunghui Lee , Ulf Hansson Subject: [PATCH 4.14 025/323] mmc: core: Set read only for SD cards with permanent write protect bit Date: Thu, 20 May 2021 11:18:37 +0200 Message-Id: <20210520092120.973461769@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210520092120.115153432@linuxfoundation.org> References: <20210520092120.115153432@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Seunghui Lee commit 917a5336f2c27928be270226ab374ed0cbf3805d upstream. Some of SD cards sets permanent write protection bit in their CSD register, due to lifespan or internal problem. To avoid unnecessary I/O write operations, let's parse the bits in the CSD during initialization and mark the card as read only for this case. Signed-off-by: Seunghui Lee Link: https://lore.kernel.org/r/20210222083156.19158-1-sh043.lee@samsung.com Cc: stable@vger.kernel.org Signed-off-by: Ulf Hansson Signed-off-by: Greg Kroah-Hartman --- drivers/mmc/core/sd.c | 6 ++++++ 1 file changed, 6 insertions(+) --- a/drivers/mmc/core/sd.c +++ b/drivers/mmc/core/sd.c @@ -138,6 +138,9 @@ static int mmc_decode_csd(struct mmc_car csd->erase_size = UNSTUFF_BITS(resp, 39, 7) + 1; csd->erase_size <<= csd->write_blkbits - 9; } + + if (UNSTUFF_BITS(resp, 13, 1)) + mmc_card_set_readonly(card); break; case 1: /* @@ -172,6 +175,9 @@ static int mmc_decode_csd(struct mmc_car csd->write_blkbits = 9; csd->write_partial = 0; csd->erase_size = 1; + + if (UNSTUFF_BITS(resp, 13, 1)) + mmc_card_set_readonly(card); break; default: pr_err("%s: unrecognised CSD structure version %d\n",