linux-kernel - [PATCH v1 1/3] scsi: ufs: Remove a redundant command completion logic in error handler

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Date:   Mon, 24 May 2021 01:36:56 -0700
From:   Can Guo <cang@...eaurora.org>
To:     asutoshd@...eaurora.org, nguyenb@...eaurora.org,
        hongwus@...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 v1 1/3] scsi: ufs: Remove a redundant command completion logic in error handler

ufshcd_host_reset_and_restore() anyways completes all pending requests
before starts re-probing, so there is no need to complete the command on
the highest bit in tr_doorbell in advance.

Signed-off-by: Can Guo <cang@...eaurora.org>
---
 drivers/scsi/ufs/ufshcd.c | 13 -------------
 1 file changed, 13 deletions(-)

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index d543864..c4b37d2 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -6123,19 +6123,6 @@ static void ufshcd_err_handler(struct work_struct *work)
 do_reset:
 	/* Fatal errors need reset */
 	if (needs_reset) {
-		unsigned long max_doorbells = (1UL << hba->nutrs) - 1;
-
-		/*
-		 * ufshcd_reset_and_restore() does the link reinitialization
-		 * which will need atleast one empty doorbell slot to send the
-		 * device management commands (NOP and query commands).
-		 * If there is no slot empty at this moment then free up last
-		 * slot forcefully.
-		 */
-		if (hba->outstanding_reqs == max_doorbells)
-			__ufshcd_transfer_req_compl(hba,
-						    (1UL << (hba->nutrs - 1)));
-
 		hba->force_reset = false;
 		spin_unlock_irqrestore(hba->host->host_lock, flags);
 		err = ufshcd_reset_and_restore(hba);
-- 
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