Based on the operating modes, handler decides whether to send mode select or not. Purpose here is to reduce
io-shipping as much as possible whenever there is an option.
Signed-off-by: Babu Moger <babu.moger@xxxxxxx>
Reviewed-by: Yanling Qi <yanling.qi@xxxxxxx>
Reviewed-by: Sudhir Dachepalli <Sudhir.Dachepalli@xxxxxxx>
Reviewed-by: Somasundaram Krishnasamy <Somasundaram.Krishnasamy@xxxxxxx>
Reviewed-by: Bob Stankey <Robert.Stankey@xxxxxxx>
Reviewed-by: Vijay Chauhan <Vijay.Chauhan@xxxxxxx>
---
--- linux-2.6.38/drivers/scsi/device_handler/scsi_dh_rdac.c.orig 2011-03-17 16:57:51.000000000 -0500
+++ linux-2.6.38/drivers/scsi/device_handler/scsi_dh_rdac.c 2011-03-17 16:59:11.000000000 -0500
@@ -670,12 +670,27 @@ static int rdac_activate(struct scsi_dev
{
struct rdac_dh_data *h = get_rdac_data(sdev);
int err = SCSI_DH_OK;
+ int act = 0;
err = check_ownership(sdev, h);
if (err != SCSI_DH_OK)
goto done;
- if (h->lun_state == RDAC_LUN_UNOWNED) {
+ switch (h->mode) {
+ case RDAC_MODE:
+ if (h->lun_state == RDAC_LUN_UNOWNED)
+ act = 1;
+ break;
+ case RDAC_MODE_IOSHIP:
+ if ((h->lun_state == RDAC_LUN_UNOWNED) &&
+ (h->preferred == RDAC_PREFERRED))
+ act = 1;
+ break;
+ default:
+ break;
+ }
+
+ if (act) {
err = queue_mode_select(sdev, fn, data);
if (err == SCSI_DH_OK)
return 0;
--
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