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Message-ID: <20221021235638.1968832-2-haowenchao@huawei.com>
Date: Fri, 21 Oct 2022 19:56:37 -0400
From: Wenchao Hao <haowenchao@...wei.com>
To: "James E . J . Bottomley" <jejb@...ux.ibm.com>,
"Martin K . Petersen" <martin.petersen@...cle.com>,
<linux-scsi@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC: Steffen Maier <maier@...ux.ibm.com>, <liuzhiqiang26@...wei.com>,
<linfeilong@...wei.com>, Wenchao Hao <haowenchao@...wei.com>
Subject: [PATCH v2 1/2] scsi: increase scsi device's iodone_cnt in scsi_timeout()
If an scsi command time out and going to be aborted, we should
increase the iodone_cnt of the related scsi device, or the
iodone_cnt would be less than iorequest_cnt
Increase iodone_cnt in scsi_timeout() would not cause double
accounting issue, briefly analysed as following:
- we add the iodone_cnt when BLK_EH_DONE would be returned in
scsi_timeout(), so the related scsi command's timeout event
would not happened
- if the abort succeed and do not retry, the command would be done
with scsi_finish_command() which would not increase iodone_cnt;
- if the abort succeed and retry the command, it would be requeue,
a scsi_dispatch_cmd() would be called and iorequest_cnt would be
increased again
- if the abort failed, the error handler successfully recover the
device, do not retry this command, the command would be done
with scsi_finish_command() which would not increase iodone_cnt;
- if the abort failed, the error handler successfully recover the
device, and retry this command, the iorequest_cnt would be
increased again
Signed-off-by: Wenchao Hao <haowenchao@...wei.com>
---
drivers/scsi/scsi_error.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
index 6995c8979230..052b00f57b56 100644
--- a/drivers/scsi/scsi_error.c
+++ b/drivers/scsi/scsi_error.c
@@ -356,6 +356,7 @@ enum blk_eh_timer_return scsi_timeout(struct request *req)
*/
if (test_and_set_bit(SCMD_STATE_COMPLETE, &scmd->state))
return BLK_EH_RESET_TIMER;
+ atomic_inc(&scmd->device->iodone_cnt);
if (scsi_abort_command(scmd) != SUCCESS) {
set_host_byte(scmd, DID_TIME_OUT);
scsi_eh_scmd_add(scmd);
--
2.35.3
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