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From:   Bean Huo <huobean@gmail.com>
To:     alim.akhtar@samsung.com, avri.altman@wdc.com,
        asutoshd@codeaurora.org, jejb@linux.ibm.com,
        martin.petersen@oracle.com, stanley.chu@mediatek.com,
        beanhuo@micron.com, bvanassche@acm.org, tomas.winkler@intel.com,
        cang@codeaurora.org
Cc:     linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH v1] scsi: ufs: no need to send one Abort Task TM in case the task in DB was cleared
Date:   Tue,  4 Aug 2020 14:35:34 +0200
Message-Id: <20200804123534.29104-1-huobean@gmail.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

From: Bean Huo <beanhuo@micron.com>

If the bit corresponds to a task in the Doorbell register has been
cleared, no need to poll the status of the task on the device side
and to send an Abort Task TM.
This patch also deletes dispensable dev_err() in case of the task
already completed.

Signed-off-by: Bean Huo <beanhuo@micron.com>
---
 drivers/scsi/ufs/ufshcd.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 307622284239..581b4ab52bf4 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -6425,19 +6425,16 @@ static int ufshcd_abort(struct scsi_cmnd *cmd)
 		return ufshcd_eh_host_reset_handler(cmd);
 
 	ufshcd_hold(hba, false);
-	reg = ufshcd_readl(hba, REG_UTP_TRANSFER_REQ_DOOR_BELL);
 	/* If command is already aborted/completed, return SUCCESS */
-	if (!(test_bit(tag, &hba->outstanding_reqs))) {
-		dev_err(hba->dev,
-			"%s: cmd at tag %d already completed, outstanding=0x%lx, doorbell=0x%x\n",
-			__func__, tag, hba->outstanding_reqs, reg);
+	if (!(test_bit(tag, &hba->outstanding_reqs)))
 		goto out;
-	}
 
+	reg = ufshcd_readl(hba, REG_UTP_TRANSFER_REQ_DOOR_BELL);
 	if (!(reg & (1 << tag))) {
 		dev_err(hba->dev,
 		"%s: cmd was completed, but without a notifying intr, tag = %d",
 		__func__, tag);
+		goto out;
 	}
 
 	/* Print Transfer Request of aborted task */
-- 
2.17.1