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[SCSI] mpt3sas: fix for kernel panic when driver loads with HBA conected to non LUN 0 configured expander

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With some enclosures when LUN 0 is not created but LUN 1 or LUN X is created
then SCSI scan procedure calls target_alloc, slave_alloc call back functions
for LUN 0 and slave_destory() for same LUN 0.

In these kind of cases within slave_destroy, pointer to scsi_target in
_sas_device structure is set to NULL, following which when slave_alloc for LUN
1 is called then starget would not be set properly for this LUN.  So,
scsi_target pointer pointing to NULL value would lead to a crash later in the
discovery procedure.

To solve this issue set the sas_device's scsi_target pointer to scsi_device's
scsi_target if it is NULL earlier in slave_alloc callback function.

Signed-off-by: Sreekanth Reddy <Sreekanth.Reddy@lsi.com>
Cc: stable@vger.kernel.org
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
This commit is contained in:
Sreekanth Reddy 2013-06-29 03:52:03 +05:30 committed by James Bottomley
parent b453ff84de
commit b65cfedf45
1 changed files with 14 additions and 0 deletions
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14
drivers/scsi/mpt3sas/mpt3sas_scsih.c
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@ -1273,6 +1273,7 @@ _scsih_slave_alloc(struct scsi_device *sdev)
struct MPT3SAS_DEVICE *sas_device_priv_data;
struct scsi_target *starget;
struct _raid_device *raid_device;
struct _sas_device *sas_device;
unsigned long flags;
sas_device_priv_data = kzalloc(sizeof(struct scsi_device), GFP_KERNEL);
@ -1301,6 +1302,19 @@ _scsih_slave_alloc(struct scsi_device *sdev)
spin_unlock_irqrestore(&ioc->raid_device_lock, flags);
}
if (!(sas_target_priv_data->flags & MPT_TARGET_FLAGS_VOLUME)) {
spin_lock_irqsave(&ioc->sas_device_lock, flags);
sas_device = mpt3sas_scsih_sas_device_find_by_sas_address(ioc,
sas_target_priv_data->sas_address);
if (sas_device && (sas_device->starget == NULL)) {
sdev_printk(KERN_INFO, sdev,
"%s : sas_device->starget set to starget @ %d\n",
__func__, __LINE__);
sas_device->starget = starget;
}
spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
}
return 0;
}