Commit 4186ab19 authored by Kurt Garloff's avatar Kurt Garloff Committed by James Bottomley
Browse files

[SCSI] Try LUN 1 and use bflags

Some devices report a peripheral qualifier of 3 for LUN 0; with the original
code, we would still try a REPORT_LUNS scan (if SCSI level is >= 3 or if we
have the BLIST_REPORTLUNS2 passed in), but NOT any sequential scan.
Also, the device at LUN 0 (which is not connected according to the PQ) is not
registered with the OS.

Unfortunately, SANs exist that are SCSI-2 and do NOT support REPORT_LUNS, but
report a unknown device with PQ 3 on LUN 0. We still need to scan them, and
most probably we even need BLIST_SPARSELUN (and BLIST_LARGELUN). See the bug
reference for an infamous example.

This is patch 1/3:
If we end up in sequential scan, at least try LUN 1 for devices
that reported a PQ of 3 for LUN 0.
Also return blacklist flags, even for PQ3 devices.
Signed-off-by: default avatarKurt Garloff <>
Signed-off-by: default avatarJames Bottomley <>
parent 907d91d7
......@@ -872,6 +872,8 @@ static int scsi_probe_and_add_lun(struct scsi_target *starget,
if (scsi_probe_lun(sdev, result, result_len, &bflags))
goto out_free_result;
if (bflagsp)
*bflagsp = bflags;
* result contains valid SCSI INQUIRY data.
......@@ -912,8 +914,6 @@ static int scsi_probe_and_add_lun(struct scsi_target *starget,
sdev->lockable = 0;
scsi_unlock_floptical(sdev, result);
if (bflagsp)
*bflagsp = bflags;
......@@ -938,7 +938,6 @@ static int scsi_probe_and_add_lun(struct scsi_target *starget,
* scsi_sequential_lun_scan - sequentially scan a SCSI target
* @starget: pointer to target structure to scan
* @bflags: black/white list flag for LUN 0
* @lun0_res: result of scanning LUN 0
* Description:
* Generally, scan from LUN 1 (LUN 0 is assumed to already have been
......@@ -948,8 +947,7 @@ static int scsi_probe_and_add_lun(struct scsi_target *starget,
* Modifies sdevscan->lun.
static void scsi_sequential_lun_scan(struct scsi_target *starget,
int bflags, int lun0_res, int scsi_level,
int rescan)
int bflags, int scsi_level, int rescan)
unsigned int sparse_lun, lun, max_dev_lun;
struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
......@@ -969,13 +967,6 @@ static void scsi_sequential_lun_scan(struct scsi_target *starget,
} else
sparse_lun = 0;
* If not sparse lun and no device attached at LUN 0 do not scan
* any further.
if (!sparse_lun && (lun0_res != SCSI_SCAN_LUN_PRESENT))
* If less than SCSI_1_CSS, and no special lun scaning, stop
* scanning; this matches 2.4 behaviour, but could just be a bug
......@@ -1384,7 +1375,7 @@ static void __scsi_scan_target(struct device *parent, unsigned int channel,
* do a sequential scan.
scsi_sequential_lun_scan(starget, bflags,
res, starget->scsi_level, rescan);
starget->scsi_level, rescan);
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