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[SCSI] add SCSI_UNKNOWN and LUN transfer limit restrictions

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Original From: Ingo Flaschberger <if@xip.at>

To support the RA4100 array from Compaq.

This patch now correctly handles SCSI_UNKNOWN types with regard to
BLIST_REPORTLUNS2 (allow it) and cdb[1] LUN inclusion (don't).

It also allows a BLIST_MAX_512 flag to restrict the maximum transfer
length to 512 blocks (apparently this is an RA4100 problem).

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
James Bottomley
2006-03-31 20:07:45 -06:00
committed by James Bottomley
parent d637c4543f
commit 4d7db04a7a
4 changed files with 21 additions and 6 deletions
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19
drivers/scsi/scsi_scan.c
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@ -673,6 +673,7 @@ static int scsi_add_lun(struct scsi_device *sdev, char *inq_result, int *bflags)
case TYPE_MEDIUM_CHANGER:
case TYPE_ENCLOSURE:
case TYPE_COMM:
case TYPE_RAID:
case TYPE_RBC:
sdev->writeable = 1;
break;
@ -737,6 +738,13 @@ static int scsi_add_lun(struct scsi_device *sdev, char *inq_result, int *bflags)
if (*bflags & BLIST_SELECT_NO_ATN)
sdev->select_no_atn = 1;
/*
* Maximum 512 sector transfer length
* broken RA4x00 Compaq Disk Array
*/
if (*bflags & BLIST_MAX_512)
blk_queue_max_sectors(sdev->request_queue, 512);
/*
* Some devices may not want to have a start command automatically
* issued when a device is added.
@ -1123,10 +1131,13 @@ static int scsi_report_lun_scan(struct scsi_target *starget, int bflags,
* Also allow SCSI-2 if BLIST_REPORTLUN2 is set and host adapter does
* support more than 8 LUNs.
*/
if ((bflags & BLIST_NOREPORTLUN) ||
starget->scsi_level < SCSI_2 ||
(starget->scsi_level < SCSI_3 &&
(!(bflags & BLIST_REPORTLUN2) || shost->max_lun <= 8)) )
if (bflags & BLIST_NOREPORTLUN)
return 1;
if (starget->scsi_level < SCSI_2 &&
starget->scsi_level != SCSI_UNKNOWN)
return 1;
if (starget->scsi_level < SCSI_3 &&
(!(bflags & BLIST_REPORTLUN2) || shost->max_lun <= 8))
return 1;
if (bflags & BLIST_NOLUN)
return 0;