diff mbox series

[v11,13/34] scsi: rdac: Fix send_mode_select retry handling

Message ID 20230905231547.83945-14-michael.christie@oracle.com (mailing list archive)
State Changes Requested
Headers show
Series [v11,01/34] scsi: Add helper to prep sense during error handling | expand

Commit Message

Mike Christie Sept. 5, 2023, 11:15 p.m. UTC 
If send_mode_select retries scsi_execute_cmd it will leave err set to
SCSI_DH_RETRY/SCSI_DH_IMM_RETRY. If on the retry, the command is
successful, then SCSI_DH_RETRY/SCSI_DH_IMM_RETRY will be returned to
the scsi_dh activation caller. On the retry, we will then detect the
previous MODE SELECT had worked, and so we will return success.

This patch has us return the correct return value, so we can avoid the
extra scsi_dh activation call and to avoid failures if the caller had
hit its activation retry limit and does not end up retrying.

Signed-off-by: Mike Christie <michael.christie@oracle.com>
---
 drivers/scsi/device_handler/scsi_dh_rdac.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

Comments

Martin Wilck Sept. 15, 2023, 8:54 p.m. UTC | #1 
On Tue, 2023-09-05 at 18:15 -0500, Mike Christie wrote:
> If send_mode_select retries scsi_execute_cmd it will leave err set to
> SCSI_DH_RETRY/SCSI_DH_IMM_RETRY. If on the retry, the command is
> successful, then SCSI_DH_RETRY/SCSI_DH_IMM_RETRY will be returned to
> the scsi_dh activation caller. On the retry, we will then detect the
> previous MODE SELECT had worked, and so we will return success.
> 
> This patch has us return the correct return value, so we can avoid
> the
> extra scsi_dh activation call and to avoid failures if the caller had
> hit its activation retry limit and does not end up retrying.
> 
> Signed-off-by: Mike Christie <michael.christie@oracle.com>

Reviewed-by: Martin Wilck <mwilck@suse.com>
diff mbox series

Patch

diff --git a/drivers/scsi/device_handler/scsi_dh_rdac.c b/drivers/scsi/device_handler/scsi_dh_rdac.c
index c5538645057a..b65586d6649c 100644
--- a/drivers/scsi/device_handler/scsi_dh_rdac.c
+++ b/drivers/scsi/device_handler/scsi_dh_rdac.c
@@ -530,7 +530,7 @@  static void send_mode_select(struct work_struct *work)
 		container_of(work, struct rdac_controller, ms_work);
 	struct scsi_device *sdev = ctlr->ms_sdev;
 	struct rdac_dh_data *h = sdev->handler_data;
-	int err = SCSI_DH_OK, retry_cnt = RDAC_RETRY_COUNT;
+	int err, retry_cnt = RDAC_RETRY_COUNT;
 	struct rdac_queue_data *tmp, *qdata;
 	LIST_HEAD(list);
 	unsigned char cdb[MAX_COMMAND_SIZE];
@@ -558,20 +558,20 @@  static void send_mode_select(struct work_struct *work)
 		(char *) h->ctlr->array_name, h->ctlr->index,
 		(retry_cnt == RDAC_RETRY_COUNT) ? "queueing" : "retrying");
 
-	if (scsi_execute_cmd(sdev, cdb, opf, &h->ctlr->mode_select, data_size,
-			     RDAC_TIMEOUT * HZ, RDAC_RETRIES, &exec_args)) {
+	if (!scsi_execute_cmd(sdev, cdb, opf, &h->ctlr->mode_select, data_size,
+			      RDAC_TIMEOUT * HZ, RDAC_RETRIES, &exec_args)) {
+		h->state = RDAC_STATE_ACTIVE;
+		RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, "
+				"MODE_SELECT completed",
+				(char *) h->ctlr->array_name, h->ctlr->index);
+		err = SCSI_DH_OK;
+	} else {
 		err = mode_select_handle_sense(sdev, &sshdr);
 		if (err == SCSI_DH_RETRY && retry_cnt--)
 			goto retry;
 		if (err == SCSI_DH_IMM_RETRY)
 			goto retry;
 	}
-	if (err == SCSI_DH_OK) {
-		h->state = RDAC_STATE_ACTIVE;
-		RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, "
-				"MODE_SELECT completed",
-				(char *) h->ctlr->array_name, h->ctlr->index);
-	}
 
 	list_for_each_entry_safe(qdata, tmp, &list, entry) {
 		list_del(&qdata->entry);