linux-kernel - [PATCH v4 05/10] scsi: ufs: Remove a redundant tag check in ufshcd

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Date:   Wed, 23 Jun 2021 00:35:05 -0700
From:   Can Guo <cang@...eaurora.org>
To:     asutoshd@...eaurora.org, nguyenb@...eaurora.org,
        hongwus@...eaurora.org, ziqichen@...eaurora.org,
        linux-scsi@...r.kernel.org, kernel-team@...roid.com,
        cang@...eaurora.org
Cc:     Alim Akhtar <alim.akhtar@...sung.com>,
        Avri Altman <avri.altman@....com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Stanley Chu <stanley.chu@...iatek.com>,
        Bean Huo <beanhuo@...ron.com>,
        Jaegeuk Kim <jaegeuk@...nel.org>,
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v4 05/10] scsi: ufs: Remove a redundant tag check in ufshcd_queuecommand()

Since commit a45f937110fa6b0c2c06a5d3ef026963a5759050 ("scsi: ufs: Optimize
host lock on transfer requests send/compl paths") has moved ufshcd state
check to front, we can remove the following tag check added for preventing
the scenario where a cmd is trying to take a lrbp, which is still in use.
This scenario can only happen if a cmd goes through the fast abort path
(whose tag is released but lrbp is not) in ufshcd_abort(), and since ufshcd
state is also changed by the fast abort path, checking the ufshcd state in
ufshcd_queuecommand() is equivalent, hence remove the tag check.

Signed-off-by: Can Guo <cang@...eaurora.org>
---
 drivers/scsi/ufs/ufshcd.c | 9 ---------
 1 file changed, 9 deletions(-)

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 5f837c4..3695dd2 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -2768,15 +2768,6 @@ static int ufshcd_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd)
 	WARN_ON(ufshcd_is_clkgating_allowed(hba) &&
 		(hba->clk_gating.state != CLKS_ON));
 
-	if (unlikely(test_bit(tag, &hba->outstanding_reqs))) {
-		if (hba->wlu_pm_op_in_progress)
-			set_host_byte(cmd, DID_BAD_TARGET);
-		else
-			err = SCSI_MLQUEUE_HOST_BUSY;
-		ufshcd_release(hba);
-		goto out;
-	}
-
 	lrbp = &hba->lrb[tag];
 	WARN_ON(lrbp->cmd);
 	lrbp->cmd = cmd;
-- 
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