From patchwork Thu Jul 2 01:32:10 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stanley Chu X-Patchwork-Id: 11637647 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id AA9A560D for ; Thu, 2 Jul 2020 01:36:24 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 84109207F5 for ; Thu, 2 Jul 2020 01:36:24 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="ghKou3mS"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=mediatek.com header.i=@mediatek.com header.b="CgwZgTOh" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 84109207F5 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=mediatek.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-mediatek-bounces+patchwork-linux-mediatek=patchwork.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:Message-ID:Date:Subject:To:From: Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender :Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References:List-Owner; bh=WGw9jWpAfXnk/TJ3qRrR+RVLuJ1I+oZNDZ8X7q0HUU8=; b=ghKou3mSSDioguCnIR7jeIEFyf 8yoIB92J0rLjzjIE94JkCnDjWFiYdowtj5ITUTdlqxJ/Me0U8iOo6Hq6Y6lCHTkZetQcZb2A4LmZI xqN7IbVu+NWopa/iG/67OrrQRy/dPwPov71l3Izkkz8HdhxpJpHLmH8Hrhf39wrv3XsbxkDIFDy25 1w99v+8+J/DU8NKbO8or4ZqSoPkUiVaRqNdchW/9RkpvSPauEl1kWBqye2aghEa9PtoyiOkRFf2W1 oAnc6H88swZEShz6WMAsmFzlhbq1EnCUIBQsxBS4XTn7Y6RTDACSPDllUEJKpReHkkvEHeTMs3hsj AfsKb+pA==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jqo94-0003Tv-Pu; Thu, 02 Jul 2020 01:36:10 +0000 Received: from mailgw02.mediatek.com ([216.200.240.185]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1jqo90-0003RZ-5H; Thu, 02 Jul 2020 01:36:08 +0000 X-UUID: 8feb783928f14ecd977ce012db768411-20200701 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=mediatek.com; s=dk; h=Content-Transfer-Encoding:Content-Type:MIME-Version:Message-ID:Date:Subject:CC:To:From; bh=Fi9mrlEmH73T+Qs6zhoiNlw3NLg/Wea1yifZo8JP4Y0=; b=CgwZgTOhBxzcJIIsXa1MesRryiPmjqC2lXgtysirnwkJ1Xsey+fsObHbO3yYDM+QY7wYeMLonWegUj8sTU7RByWh/LN13iAEPyohjXt8+AOKEZ4OaipRhRC9ZWsEB2djGRmfbiuZlC+0AX0J1RKwW3fSwz/whxBtTqc8vCI0kWQ=; X-UUID: 8feb783928f14ecd977ce012db768411-20200701 Received: from mtkcas66.mediatek.inc [(172.29.193.44)] by mailgw02.mediatek.com (envelope-from ) (musrelay.mediatek.com ESMTP with TLS) with ESMTP id 34980336; Wed, 01 Jul 2020 17:35:50 -0800 Received: from MTKMBS02N2.mediatek.inc (172.21.101.101) by MTKMBS62N1.mediatek.inc (172.29.193.41) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Wed, 1 Jul 2020 18:32:39 -0700 Received: from mtkcas08.mediatek.inc (172.21.101.126) by mtkmbs02n2.mediatek.inc (172.21.101.101) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Thu, 2 Jul 2020 09:32:24 +0800 Received: from mtksdccf07.mediatek.inc (172.21.84.99) by mtkcas08.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Thu, 2 Jul 2020 09:32:20 +0800 From: Stanley Chu To: , , , , , Subject: [RFC PATCH v1] scsi: ufs: Quiesce all scsi devices before shutdown Date: Thu, 2 Jul 2020 09:32:10 +0800 Message-ID: <20200702013210.22958-1-stanley.chu@mediatek.com> X-Mailer: git-send-email 2.18.0 MIME-Version: 1.0 X-TM-SNTS-SMTP: 18A2182863CD6381535D3CFD5930C92F55638ED85AF7A2AFA65EACC53C1742932000:8 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200701_213606_343452_0802532B X-CRM114-Status: UNSURE ( 9.04 ) X-CRM114-Notice: Please train this message. X-Spam-Score: -0.2 (/) X-Spam-Report: SpamAssassin version 3.4.4 on merlin.infradead.org summary: Content analysis details: (-0.2 points) pts rule name description ---- ---------------------- -------------------------------------------------- 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.0 SPF_PASS SPF: sender matches SPF record 0.0 MIME_BASE64_TEXT RAW: Message text disguised using base64 encoding -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid 0.0 UNPARSEABLE_RELAY Informational: message has unparseable relay lines X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Stanley Chu , andy.teng@mediatek.com, cc.chou@mediatek.com, chun-hung.wu@mediatek.com, kuohong.wang@mediatek.com, linux-kernel@vger.kernel.org, cang@codeaurora.org, linux-mediatek@lists.infradead.org, peter.wang@mediatek.com, matthias.bgg@gmail.com, beanhuo@micron.com, chaotian.jing@mediatek.com, linux-arm-kernel@lists.infradead.org, asutoshd@codeaurora.org Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+patchwork-linux-mediatek=patchwork.kernel.org@lists.infradead.org Currently I/O request could be still submitted to UFS device while UFS is working on shutdown flow. This may lead to racing as below scenarios and finally system may crash due to unclocked register accesses. To fix this kind of issues, specifically quiesce all SCSI devices before UFS shutdown to block all I/O request sending from block layer. Example of racing scenario: While UFS device is runtime-suspended Thread #1: Executing UFS shutdown flow, e.g., ufshcd_suspend(UFS_SHUTDOWN_PM) Thread #2: Executing runtime resume flow triggered by I/O request, e.g., ufshcd_resume(UFS_RUNTIME_PM) This breaks the assumption that UFS PM flows can not be running concurrently and thus some unexpected racing behavior may happen. Signed-off-by: Stanley Chu --- drivers/scsi/ufs/ufshcd.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index 59358bb75014..cadfa9006972 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -8599,10 +8599,14 @@ EXPORT_SYMBOL(ufshcd_runtime_idle); int ufshcd_shutdown(struct ufs_hba *hba) { int ret = 0; + struct scsi_target *starget; if (!hba->is_powered) goto out; + list_for_each_entry(starget, &hba->host->__targets, siblings) + scsi_target_quiesce(starget); + if (ufshcd_is_ufs_dev_poweroff(hba) && ufshcd_is_link_off(hba)) goto out;