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

commit b65cfedf4560af65305bd7b3b9f26c02c6fb3660 upstream.

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>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 14 insertions, 0 deletions

diff --git a/drivers/scsi/mpt3sas/mpt3sas_scsih.c b/drivers/scsi/mpt3sas/mpt3sas_scsih.c
index 1fb5c6bcb786..f8c4b8564251 100644
--- a/drivers/scsi/mpt3sas/mpt3sas_scsih.c
+++ b/drivers/scsi/mpt3sas/mpt3sas_scsih.c
@@ -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;
 }