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scsi_dh_alua: rework alua_check_tpgs() to return the tpgs mode 

Instead of returning an error code in alua_check_tpgs() we should
rather return the tpgs mode directly and have a cleaner syntax.

Signed-off-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Hannes Reinecke 2015-12-01 10:16:53 +01:00 committed by Martin K. Petersen
parent a7089770b9
commit ad0ea64c53
1 changed files with 11 additions and 14 deletions
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25
drivers/scsi/device_handler/scsi_dh_alua.c
View File

@ -262,24 +262,23 @@ static unsigned submit_stpg(struct alua_dh_data *h)
* Examine the TPGS setting of the sdev to find out if ALUA
* is supported.
*/
static int alua_check_tpgs(struct scsi_device *sdev, struct alua_dh_data *h)
static int alua_check_tpgs(struct scsi_device *sdev)
{
int err = SCSI_DH_OK;
int tpgs = TPGS_MODE_NONE;
/*
* ALUA support for non-disk devices is fraught with
* difficulties, so disable it for now.
*/
if (sdev->type != TYPE_DISK) {
h->tpgs = TPGS_MODE_NONE;
sdev_printk(KERN_INFO, sdev,
"%s: disable for non-disk devices\n",
ALUA_DH_NAME);
return SCSI_DH_DEV_UNSUPP;
return tpgs;
}
h->tpgs = scsi_device_tpgs(sdev);
switch (h->tpgs) {
tpgs = scsi_device_tpgs(sdev);
switch (tpgs) {
case TPGS_MODE_EXPLICIT|TPGS_MODE_IMPLICIT:
sdev_printk(KERN_INFO, sdev,
"%s: supports implicit and explicit TPGS\n",
@ -296,18 +295,16 @@ static int alua_check_tpgs(struct scsi_device *sdev, struct alua_dh_data *h)
case TPGS_MODE_NONE:
sdev_printk(KERN_INFO, sdev, "%s: not supported\n",
ALUA_DH_NAME);
err = SCSI_DH_DEV_UNSUPP;
break;
default:
sdev_printk(KERN_INFO, sdev,
"%s: unsupported TPGS setting %d\n",
ALUA_DH_NAME, h->tpgs);
h->tpgs = TPGS_MODE_NONE;
err = SCSI_DH_DEV_UNSUPP;
ALUA_DH_NAME, tpgs);
tpgs = TPGS_MODE_NONE;
break;
}
return err;
return tpgs;
}
/*
@ -627,10 +624,10 @@ static int alua_rtpg(struct scsi_device *sdev, struct alua_dh_data *h, int wait_
*/
static int alua_initialize(struct scsi_device *sdev, struct alua_dh_data *h)
{
int err;
int err = SCSI_DH_DEV_UNSUPP;
err = alua_check_tpgs(sdev, h);
if (err != SCSI_DH_OK)
h->tpgs = alua_check_tpgs(sdev);
if (h->tpgs == TPGS_MODE_NONE)
goto out;
err = alua_check_vpd(sdev, h);