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scsi_dh_alua: simplify sense code handling 

Most sense code is already handled in the generic
code, so we shouldn't be adding special cases here.
However, when doing so we need to check for
unit attention whenever we're sending an internal
command.

Signed-off-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Ewan Milne <emilne@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Hannes Reinecke 2015-12-01 10:16:54 +01:00 committed by Martin K. Petersen
parent ad0ea64c53
commit e2d817db32
1 changed files with 17 additions and 28 deletions
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45
drivers/scsi/device_handler/scsi_dh_alua.c
View File

@ -85,7 +85,6 @@ struct alua_dh_data {
#define ALUA_POLICY_SWITCH_ALL 1
static char print_alua_state(int);
static int alua_check_sense(struct scsi_device *, struct scsi_sense_hdr *);
static int realloc_buffer(struct alua_dh_data *h, unsigned len)
{
@ -189,8 +188,13 @@ static void stpg_endio(struct request *req, int error)
if (scsi_normalize_sense(h->sense, SCSI_SENSE_BUFFERSIZE,
&sense_hdr)) {
err = alua_check_sense(h->sdev, &sense_hdr);
if (err == ADD_TO_MLQUEUE) {
if (sense_hdr.sense_key == NOT_READY &&
sense_hdr.asc == 0x04 && sense_hdr.ascq == 0x0a) {
/* ALUA state transition already in progress */
err = SCSI_DH_OK;
goto done;
}
if (sense_hdr.sense_key == UNIT_ATTENTION) {
err = SCSI_DH_RETRY;
goto done;
}
@ -399,28 +403,6 @@ static int alua_check_sense(struct scsi_device *sdev,
* LUN Not Accessible - ALUA state transition
*/
return ADD_TO_MLQUEUE;
if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x0b)
/*
* LUN Not Accessible -- Target port in standby state
*/
return SUCCESS;
if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x0c)
/*
* LUN Not Accessible -- Target port in unavailable state
*/
return SUCCESS;
if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x12)
/*
* LUN Not Ready -- Offline
*/
return SUCCESS;
if (sdev->allow_restart &&
sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x02)
/*
* if the device is not started, we need to wake
* the error handler to start the motor
*/
return FAILED;
break;
case UNIT_ATTENTION:
if (sense_hdr->asc == 0x29 && sense_hdr->ascq == 0x00)
@ -517,9 +499,16 @@ static int alua_rtpg(struct scsi_device *sdev, struct alua_dh_data *h, int wait_
h->flags |= ALUA_RTPG_EXT_HDR_UNSUPP;
goto retry;
}
err = alua_check_sense(sdev, &sense_hdr);
if (err == ADD_TO_MLQUEUE && time_before(jiffies, expiry)) {
/*
* Retry on ALUA state transition or if any
* UNIT ATTENTION occurred.
*/
if (sense_hdr.sense_key == NOT_READY &&
sense_hdr.asc == 0x04 && sense_hdr.ascq == 0x0a)
err = SCSI_DH_RETRY;
else if (sense_hdr.sense_key == UNIT_ATTENTION)
err = SCSI_DH_RETRY;
if (err == SCSI_DH_RETRY && time_before(jiffies, expiry)) {
sdev_printk(KERN_ERR, sdev, "%s: rtpg retry\n",
ALUA_DH_NAME);
scsi_print_sense_hdr(sdev, ALUA_DH_NAME, &sense_hdr);