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[SCSI] scsi_dh_rdac : decide whether to send mode select based on operating mode

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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@lsi.com>
Reviewed-by: Yanling Qi <yanling.qi@lsi.com>
Reviewed-by: Sudhir Dachepalli <Sudhir.Dachepalli@lis.com>
Reviewed-by: Somasundaram Krishnasamy <Somasundaram.Krishnasamy@lsi.com>
Reviewed-by: Bob Stankey <Robert.Stankey@lsi.com>
Reviewed-by: Vijay Chauhan <Vijay.Chauhan@lsi.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
This commit is contained in:
Moger, Babu 2011-04-08 11:39:30 -06:00 committed by James Bottomley
parent 1c3afc4234
commit 3425fbfe22
1 changed files with 16 additions and 1 deletions
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17
drivers/scsi/device_handler/scsi_dh_rdac.c
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@ -670,12 +670,27 @@ static int rdac_activate(struct scsi_device *sdev,
{
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;