linux-kernel - [PATCH v3 2/2] scsi: donot increase scsi_device's iorequest

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Date:   Wed, 23 Nov 2022 20:21:37 +0800
From:   Wenchao Hao <haowenchao@...wei.com>
To:     Lee Duncan <lduncan@...e.com>, Chris Leech <cleech@...hat.com>,
        "Mike Christie" <michael.christie@...cle.com>,
        "James E . J . Bottomley" <jejb@...ux.ibm.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        <open-iscsi@...glegroups.com>, <linux-scsi@...r.kernel.org>
CC:     <linux-kernel@...r.kernel.org>, <liuzhiqiang26@...wei.com>,
        <linfeilong@...wei.com>, Wenchao Hao <haowenchao@...wei.com>
Subject: [PATCH v3 2/2] scsi: donot increase scsi_device's iorequest_cnt if dispatch failed

If scsi_dispatch_cmd() failed, the scsi command did not send to disks,
so it would never done from LLDs.

scsi scsi_queue_rq() would return BLK_STS_RESOURCE if
scsi_dispatch_cmd() failed, the related request would be requeued, and
the timeout of this request would not fired any more, so no one
would increase iodone_cnt which matches with this increase of
iorequest_cnt.

Signed-off-by: Wenchao Hao <haowenchao@...wei.com>
Reviewed-by: Mike Christie <michael.christie@...cle.com>
---
 drivers/scsi/scsi_lib.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index ec890865abae..a29d87e57430 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -1464,8 +1464,6 @@ static int scsi_dispatch_cmd(struct scsi_cmnd *cmd)
 	struct Scsi_Host *host = cmd->device->host;
 	int rtn = 0;
 
-	atomic_inc(&cmd->device->iorequest_cnt);
-
 	/* check if the device is still usable */
 	if (unlikely(cmd->device->sdev_state == SDEV_DEL)) {
 		/* in SDEV_DEL we error all commands. DID_NO_CONNECT
@@ -1764,6 +1762,7 @@ static blk_status_t scsi_queue_rq(struct blk_mq_hw_ctx *hctx,
 		goto out_dec_host_busy;
 	}
 
+	atomic_inc(&cmd->device->iorequest_cnt);
 	return BLK_STS_OK;
 
 out_dec_host_busy:
-- 
2.32.0