linux-kernel - [PATCH v2 1/2] scsi: ufs: Cleanup completed request without interrupt notification

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Date:   Tue, 11 Aug 2020 16:18:58 +0200
From:   Bean Huo <huobean@...il.com>
To:     alim.akhtar@...sung.com, avri.altman@....com,
        asutoshd@...eaurora.org, jejb@...ux.ibm.com,
        martin.petersen@...cle.com, stanley.chu@...iatek.com,
        beanhuo@...ron.com, bvanassche@....org, tomas.winkler@...el.com,
        cang@...eaurora.org
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 1/2] scsi: ufs: Cleanup completed request without interrupt notification

From: Stanley Chu <stanley.chu@...iatek.com>

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 <stanley.chu@...iatek.com>
Reviewed-by: Can Guo <cang@...eaurora.org>
Signed-off-by: Bean Huo <beanhuo@...ron.com>
---
 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 307622284239..66fe814c8725 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -6492,7 +6492,7 @@ 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",
@@ -6526,6 +6526,7 @@ static int ufshcd_abort(struct scsi_cmnd *cmd)
 		goto out;
 	}

+cleanup:
 	scsi_dma_unmap(cmd);

 	spin_lock_irqsave(host->host_lock, flags);
-- 
2.17.1