From mboxrd@z Thu Jan 1 00:00:00 1970 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=-9.8 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 83FA0C433E1 for ; Tue, 4 Aug 2020 10:02:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 83E6422CBB for ; Tue, 4 Aug 2020 10:02:45 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=mg.codeaurora.org header.i=@mg.codeaurora.org header.b="Iy7PmLTy" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730102AbgHDKCo (ORCPT ); Tue, 4 Aug 2020 06:02:44 -0400 Received: from mail29.static.mailgun.info ([104.130.122.29]:25462 "EHLO mail29.static.mailgun.info" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729297AbgHDKCo (ORCPT ); Tue, 4 Aug 2020 06:02:44 -0400 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1596535363; h=Message-ID: References: In-Reply-To: Subject: Cc: To: From: Date: Content-Transfer-Encoding: Content-Type: MIME-Version: Sender; bh=YAQTCZ79EPZUswUxRse5WYWCeMi7TP/yJqj2ZFCTdds=; b=Iy7PmLTyB8P8U9t7N9a2KP4fPW1GbonJ9AhIz3kr70KvBmsKzRpc55gf7QbJ7bzneoTXXJs1 2+YwWKgaBBYX4CDFTzjHcm2bLJhcd30bnhmkjemgW2ygJk/qMd5+d82x+VAWOINqkztwPR19 oSj3fA0U5HOTRcrn06usGr5aUbE= X-Mailgun-Sending-Ip: 104.130.122.29 X-Mailgun-Sid: WyJlNmU5NiIsICJsaW51eC1zY3NpQHZnZXIua2VybmVsLm9yZyIsICJiZTllNGEiXQ== Received: from smtp.codeaurora.org (ec2-35-166-182-171.us-west-2.compute.amazonaws.com [35.166.182.171]) by smtp-out-n14.prod.us-east-1.postgun.com with SMTP id 5f2931f276a940cda82cd66f (version=TLS1.2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256); Tue, 04 Aug 2020 10:01:22 GMT Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 7742DC43391; Tue, 4 Aug 2020 10:01:21 +0000 (UTC) Received: from mail.codeaurora.org (localhost.localdomain [127.0.0.1]) (using TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) (Authenticated sender: cang) by smtp.codeaurora.org (Postfix) with ESMTPSA id 15242C433C9; Tue, 4 Aug 2020 10:01:19 +0000 (UTC) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 7bit Date: Tue, 04 Aug 2020 18:01:19 +0800 From: Can Guo To: Stanley Chu Cc: linux-scsi@vger.kernel.org, martin.petersen@oracle.com, avri.altman@wdc.com, alim.akhtar@samsung.com, jejb@linux.ibm.com, bvanassche@acm.org, beanhuo@micron.com, asutoshd@codeaurora.org, matthias.bgg@gmail.com, linux-mediatek@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, kuohong.wang@mediatek.com, peter.wang@mediatek.com, chun-hung.wu@mediatek.com, andy.teng@mediatek.com, chaotian.jing@mediatek.com, cc.chou@mediatek.com Subject: Re: [PATCH v4] scsi: ufs: Cleanup completed request without interrupt notification In-Reply-To: <20200724140246.19434-1-stanley.chu@mediatek.com> References: <20200724140246.19434-1-stanley.chu@mediatek.com> Message-ID: X-Sender: cang@codeaurora.org User-Agent: Roundcube Webmail/1.3.9 Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org On 2020-07-24 22:02, Stanley Chu wrote: > If somehow no interrupt notification is raised for a completed request > and its doorbell bit is cleared by host, UFS driver needs to cleanup > its outstanding bit in ufshcd_abort(). Otherwise, system may behave > abnormally by below flow: > > After ufshcd_abort() returns, this request will be requeued by SCSI > layer with its outstanding bit set. Any future completed request > will trigger ufshcd_transfer_req_compl() to handle all "completed > outstanding bits". In this time, the "abnormal outstanding bit" > will be detected and the "requeued request" will be chosen to execute > request post-processing flow. This is wrong because this request is > still "alive". > > Signed-off-by: Stanley Chu > --- > drivers/scsi/ufs/ufshcd.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c > index 577cc0d7487f..9d180da77488 100644 > --- a/drivers/scsi/ufs/ufshcd.c > +++ b/drivers/scsi/ufs/ufshcd.c > @@ -6493,7 +6493,7 @@ static int ufshcd_abort(struct scsi_cmnd *cmd) > /* command completed already */ > dev_err(hba->dev, "%s: cmd at tag %d successfully cleared from > DB.\n", > __func__, tag); > - goto out; > + goto cleanup; > } else { > dev_err(hba->dev, > "%s: no response from device. tag = %d, err %d\n", > @@ -6527,6 +6527,7 @@ static int ufshcd_abort(struct scsi_cmnd *cmd) > goto out; > } > > +cleanup: > scsi_dma_unmap(cmd); > > spin_lock_irqsave(host->host_lock, flags); Reviewed-by: Can Guo