From patchwork Wed Oct 12 18:37:58 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christian Loehle X-Patchwork-Id: 615194 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 523E3C4332F for ; Wed, 12 Oct 2022 18:38:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229793AbiJLSiG convert rfc822-to-8bit (ORCPT ); Wed, 12 Oct 2022 14:38:06 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59382 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229885AbiJLSiF (ORCPT ); Wed, 12 Oct 2022 14:38:05 -0400 Received: from mail4.swissbit.com (mail4.swissbit.com [176.95.1.100]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 190896F546; Wed, 12 Oct 2022 11:38:04 -0700 (PDT) Received: from mail4.swissbit.com (localhost [127.0.0.1]) by DDEI (Postfix) with ESMTP id 1294F122F07; Wed, 12 Oct 2022 20:38:02 +0200 (CEST) Received: from mail4.swissbit.com (localhost [127.0.0.1]) by DDEI (Postfix) with ESMTP id E898C122EDD; Wed, 12 Oct 2022 20:38:01 +0200 (CEST) X-TM-AS-ERS: 10.149.2.42-127.5.254.253 X-TM-AS-SMTP: 1.0 ZXguc3dpc3NiaXQuY29t Y2xvZWhsZUBoeXBlcnN0b25lLmNvbQ== X-DDEI-TLS-USAGE: Used Received: from ex.swissbit.com (unknown [10.149.2.42]) by mail4.swissbit.com (Postfix) with ESMTPS; Wed, 12 Oct 2022 20:38:01 +0200 (CEST) Received: from sbdeex04.sbitdom.lan (10.149.2.42) by sbdeex04.sbitdom.lan (10.149.2.42) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.9; Wed, 12 Oct 2022 20:38:01 +0200 Received: from sbdeex04.sbitdom.lan ([fe80::2047:4968:b5a0:1818]) by sbdeex04.sbitdom.lan ([fe80::2047:4968:b5a0:1818%9]) with mapi id 15.02.1118.009; Wed, 12 Oct 2022 20:37:58 +0200 From: =?iso-8859-1?q?Christian_L=F6hle?= To: Adrian Hunter , Ulf Hansson , Linux MMC List , "linux-kernel@vger.kernel.org" Subject: [PATCHv4 1/2] mmc: block: Remove error check of hw_reset on reset Thread-Topic: [PATCHv4 1/2] mmc: block: Remove error check of hw_reset on reset Thread-Index: Adjeaabz7a/Vp/YESbKGERCtIHQ41g== Date: Wed, 12 Oct 2022 18:37:58 +0000 Message-ID: Accept-Language: en-US, de-DE Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.242.2.2] MIME-Version: 1.0 X-TMASE-Version: DDEI-5.1-9.0.1002-27198.001 X-TMASE-Result: 10-0.521300-10.000000 X-TMASE-MatchedRID: dc8Jy61QoRpgljMcj2tyXt5x7RpGJf1a4SkIdSwphgahLh9e7qvSIg2V 4b0zHULvGgn/HW4MjTmKoat5I/Uj/worSvYb1VTuKsurITpSv+M2LwvzxRX0gMC5DTEMxpeQfiq 1gj2xET9dBLSzNqCHg1o4rfBbwEORvvHAd28bGMe5x7uAXGEprfWr7HvOSElar4YC4lUEmf2Ypu G7kpoKR5p6VbtqvFM0+WatSktubmiel3N+gDvB54knvYO5kHScNUSduuqYHDuZtziFUn+D+UzAk Vmkw08mi/rJKndm3e8gE0bHoPl2Aq+/EguYor8cEzQnFLEeMUndB/CxWTRRu/558CedkGIvqcoA hihTwvhT9DdstK6naoyidLLBmKNP4BqxW0NCo8420zviUk4+fiXH6tsKNnAM X-TMASE-SNAP-Result: 1.821001.0001-0-1-22:0,33:0,34:0-0 X-TMASE-INERTIA: 0-0;;;; X-TMASE-XGENCLOUD: 29804778-e865-4b84-b688-f2a6fce2c007-0-0-200-0 Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org Before switching back to the right partition in mmc_blk_reset there used to be a check if hw_reset was even supported. This return value was removed, so there is no reason to check. Furthermore ensure part_curr is not falsely set to a valid value on reset or partition switch error. As part of this change the code paths of mmc_blk_reset calls were checked to ensure no commands are issued after a failed mmc_blk_reset directly without going through the block layer. Fixes: fefdd3c91e0a ("mmc: core: Drop superfluous validations in mmc_hw|sw_reset()") Cc: stable@vger.kernel.org Signed-off-by: Christian Loehle --- -v4: Only partition switch if necessary and fix one mmc_blk_reset call -v3: Ensure invalid part_curr on error -v2: Do not attempt to switch partitions if reset failed drivers/mmc/core/block.c | 42 ++++++++++++++++++++++++---------------- 1 file changed, 25 insertions(+), 17 deletions(-) diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c index ce89611a136e..2619cc47b97c 100644 --- a/drivers/mmc/core/block.c +++ b/drivers/mmc/core/block.c @@ -134,6 +134,7 @@ struct mmc_blk_data { * track of the current selected device partition. */ unsigned int part_curr; +#define MMC_BLK_PART_INVALID UINT_MAX /* Unknown partition active */ int area_type; /* debugfs files (only in main mmc_blk_data) */ @@ -987,33 +988,39 @@ static unsigned int mmc_blk_data_timeout_ms(struct mmc_host *host, return ms; } +/* + * Attempts to reset the card and get back to the requested partition. + * Therefore any error here must result in cancelling the block layer + * request, it must not be reattempted without going through the mmc_blk + * partition sanity checks. + */ static int mmc_blk_reset(struct mmc_blk_data *md, struct mmc_host *host, int type) { int err; + struct mmc_blk_data *main_md = dev_get_drvdata(&host->card->dev); if (md->reset_done & type) return -EEXIST; md->reset_done |= type; err = mmc_hw_reset(host->card); + /* + * A successful reset will leave the card in the main partition, but + * upon failure it might not be, so set it to MMC_BLK_PART_INVALID + * in that case. + */ + main_md->part_curr = err ? MMC_BLK_PART_INVALID : main_md->part_type; + if (err) + return err; /* Ensure we switch back to the correct partition */ - if (err) { - struct mmc_blk_data *main_md = - dev_get_drvdata(&host->card->dev); - int part_err; - - main_md->part_curr = main_md->part_type; - part_err = mmc_blk_part_switch(host->card, md->part_type); - if (part_err) { - /* - * We have failed to get back into the correct - * partition, so we need to abort the whole request. - */ - return -ENODEV; - } - } - return err; + if (mmc_blk_part_switch(host->card, md->part_type)) + /* + * We have failed to get back into the correct + * partition, so we need to abort the whole request. + */ + return -ENODEV; + return 0; } static inline void mmc_blk_reset_success(struct mmc_blk_data *md, int type) @@ -1868,7 +1875,8 @@ static void mmc_blk_mq_rw_recovery(struct mmc_queue *mq, struct request *req) /* Reset before last retry */ if (mqrq->retries + 1 == MMC_MAX_RETRIES) - mmc_blk_reset(md, card->host, type); + if (mmc_blk_reset(md, card->host, type)) + return; /* Command errors fail fast, so use all MMC_MAX_RETRIES */ if (brq->sbc.error || brq->cmd.error)