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[SCSI] hpsa: fix physical device lun and target numbering problem 

If a physical device exposed to the OS by hpsa
is replaced (e.g. one hot plug tape drive is replaced
by another, or a tape drive is placed into "OBDR" mode
in which it acts like a CD-ROM device) and a rescan is
initiated, the replaced device will be added to the
SCSI midlayer with target and lun numbers set to -1.
After that, a panic is likely to ensue.  When a physical
device is replaced, the lun and target number should be
preserved.

Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Cc: stable@kernel.org
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
This commit is contained in:
Stephen M. Cameron 2011-08-09 08:18:01 -05:00 committed by James Bottomley
parent 0b0e1d6cbc
commit 01350d0553
1 changed files with 10 additions and 0 deletions
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10
drivers/scsi/hpsa.c
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@ -676,6 +676,16 @@ static void hpsa_scsi_replace_entry(struct ctlr_info *h, int hostno,
BUG_ON(entry < 0 || entry >= HPSA_MAX_SCSI_DEVS_PER_HBA);
removed[*nremoved] = h->dev[entry];
(*nremoved)++;
/*
* New physical devices won't have target/lun assigned yet
* so we need to preserve the values in the slot we are replacing.
*/
if (new_entry->target == -1) {
new_entry->target = h->dev[entry]->target;
new_entry->lun = h->dev[entry]->lun;
}
h->dev[entry] = new_entry;
added[*nadded] = new_entry;
(*nadded)++;