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target/pscsi: Fix TYPE_TAPE + TYPE_MEDIMUM_CHANGER export

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The following fixes a divide by zero OOPs with TYPE_TAPE
due to pscsi_tape_read_blocksize() failing causing a zero
sd->sector_size being propigated up via dev_attrib.hw_block_size.

It also fixes another long-standing bug where TYPE_TAPE and
TYPE_MEDIMUM_CHANGER where using pscsi_create_type_other(),
which does not call scsi_device_get() to take the device
reference.  Instead, rename pscsi_create_type_rom() to
pscsi_create_type_nondisk() and use it for all cases.

Finally, also drop a dump_stack() in pscsi_get_blocks() for
non TYPE_DISK, which in modern target-core can get invoked
via target_sense_desc_format() during CHECK_CONDITION.

Reported-by: Malcolm Haak <insanemal@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Nicholas Bellinger 2016-11-03 23:06:53 -07:00
parent c1ae3cfa0e
commit a04e54f2c3
1 changed files with 12 additions and 35 deletions
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47
drivers/target/target_core_pscsi.c
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@ -154,7 +154,7 @@ static void pscsi_tape_read_blocksize(struct se_device *dev,
buf = kzalloc(12, GFP_KERNEL);
if (!buf)
return;
goto out_free;
memset(cdb, 0, MAX_COMMAND_SIZE);
cdb[0] = MODE_SENSE;
@ -169,9 +169,10 @@ static void pscsi_tape_read_blocksize(struct se_device *dev,
* If MODE_SENSE still returns zero, set the default value to 1024.
*/
sdev->sector_size = (buf[9] << 16) | (buf[10] << 8) | (buf[11]);
out_free:
if (!sdev->sector_size)
sdev->sector_size = 1024;
out_free:
kfree(buf);
}
@ -314,9 +315,10 @@ static int pscsi_add_device_to_list(struct se_device *dev,
sd->lun, sd->queue_depth);
}
dev->dev_attrib.hw_block_size = sd->sector_size;
dev->dev_attrib.hw_block_size =
min_not_zero((int)sd->sector_size, 512);
dev->dev_attrib.hw_max_sectors =
min_t(int, sd->host->max_sectors, queue_max_hw_sectors(q));
min_not_zero(sd->host->max_sectors, queue_max_hw_sectors(q));
dev->dev_attrib.hw_queue_depth = sd->queue_depth;
/*
@ -339,8 +341,10 @@ static int pscsi_add_device_to_list(struct se_device *dev,
/*
* For TYPE_TAPE, attempt to determine blocksize with MODE_SENSE.
*/
if (sd->type == TYPE_TAPE)
if (sd->type == TYPE_TAPE) {
pscsi_tape_read_blocksize(dev, sd);
dev->dev_attrib.hw_block_size = sd->sector_size;
}
return 0;
}
@ -406,7 +410,7 @@ static int pscsi_create_type_disk(struct se_device *dev, struct scsi_device *sd)
/*
* Called with struct Scsi_Host->host_lock called.
*/
static int pscsi_create_type_rom(struct se_device *dev, struct scsi_device *sd)
static int pscsi_create_type_nondisk(struct se_device *dev, struct scsi_device *sd)
__releases(sh->host_lock)
{
struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr;
@ -433,28 +437,6 @@ static int pscsi_create_type_rom(struct se_device *dev, struct scsi_device *sd)
return 0;
}
/*
* Called with struct Scsi_Host->host_lock called.
*/
static int pscsi_create_type_other(struct se_device *dev,
struct scsi_device *sd)
__releases(sh->host_lock)
{
struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr;
struct Scsi_Host *sh = sd->host;
int ret;
spin_unlock_irq(sh->host_lock);
ret = pscsi_add_device_to_list(dev, sd);
if (ret)
return ret;
pr_debug("CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d:%llu\n",
phv->phv_host_id, scsi_device_type(sd->type), sh->host_no,
sd->channel, sd->id, sd->lun);
return 0;
}
static int pscsi_configure_device(struct se_device *dev)
{
struct se_hba *hba = dev->se_hba;
@ -542,11 +524,8 @@ static int pscsi_configure_device(struct se_device *dev)
case TYPE_DISK:
ret = pscsi_create_type_disk(dev, sd);
break;
case TYPE_ROM:
ret = pscsi_create_type_rom(dev, sd);
break;
default:
ret = pscsi_create_type_other(dev, sd);
ret = pscsi_create_type_nondisk(dev, sd);
break;
}
@ -611,8 +590,7 @@ static void pscsi_free_device(struct se_device *dev)
else if (pdv->pdv_lld_host)
scsi_host_put(pdv->pdv_lld_host);
if ((sd->type == TYPE_DISK) || (sd->type == TYPE_ROM))
scsi_device_put(sd);
scsi_device_put(sd);
pdv->pdv_sd = NULL;
}
@ -1064,7 +1042,6 @@ static sector_t pscsi_get_blocks(struct se_device *dev)
if (pdv->pdv_bd && pdv->pdv_bd->bd_part)
return pdv->pdv_bd->bd_part->nr_sects;
dump_stack();
return 0;
}