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Wed, 01 Jul 2020 20:18:58 -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 21:18:58 -0700 Received: from mtkcas07.mediatek.inc (172.21.101.84) by mtkmbs02n2.mediatek.inc (172.21.101.101) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Thu, 2 Jul 2020 12:18:50 +0800 Received: from mtksdccf07.mediatek.inc (172.21.84.99) by mtkcas07.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Thu, 2 Jul 2020 12:18:50 +0800 From: Stanley Chu To: , , , , , Subject: [PATCH v2] scsi: ufs: Cleanup completed request without interrupt notification Date: Thu, 2 Jul 2020 12:18:50 +0800 Message-ID: <20200702041850.28028-1-stanley.chu@mediatek.com> X-Mailer: git-send-email 2.18.0 MIME-Version: 1.0 X-TM-SNTS-SMTP: C1DD82904CC95CD3D55608FC5688E3E24E6DF85F9CF1A10FBA16024867C278752000:8 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200702_001911_837994_BC1E4E3F X-CRM114-Status: GOOD ( 11.74 ) 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-arm-kernel@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-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org 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 crash by below abnormal flow: After this request is requeued by SCSI layer with its outstanding bit set, the next 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 and blk_finish_request() will BUG_ON because this request is still "alive". It is worth mentioning that before ufshcd_abort() cleans the timed-out request, driver needs to check again if this request is really not handled by __ufshcd_transfer_req_compl() yet because it is possible that its interrupt comes very lately before the cleaning. Signed-off-by: Stanley Chu --- drivers/scsi/ufs/ufshcd.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index cadfa9006972..0f4f3255e403 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -6462,7 +6462,7 @@ 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", @@ -6496,9 +6496,14 @@ static int ufshcd_abort(struct scsi_cmnd *cmd) goto out; } +cleanup: + spin_lock_irqsave(host->host_lock, flags); + if (!test_bit(tag, hba->outstanding_reqs)) { + spin_unlock_irqrestore(host->host_lock, flags); + goto out; + } scsi_dma_unmap(cmd); - spin_lock_irqsave(host->host_lock, flags); ufshcd_outstanding_req_clear(hba, tag); hba->lrb[tag].cmd = NULL; spin_unlock_irqrestore(host->host_lock, flags);