[SCSI] libsas: Add SAS_HA state flags to avoid queueing events while unloading

Track sas_ha_struct state so that we ignore events that come in while
we're shutting things down.

Signed-off-by: Malahal Naineni <malahal@us.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 7 insertions, 2 deletions

diff --git a/drivers/scsi/libsas/sas_internal.h b/drivers/scsi/libsas/sas_internal.h
index 137d7e496b6d..a78638df2018 100644
--- a/drivers/scsi/libsas/sas_internal.h
+++ b/drivers/scsi/libsas/sas_internal.h
@@ -80,7 +80,7 @@ void sas_hae_reset(struct work_struct *work);
 static inline void sas_queue_event(int event, spinlock_t *lock,
                                    unsigned long *pending,
                                    struct work_struct *work,
-                                   struct Scsi_Host *shost)
+                                   struct sas_ha_struct *sas_ha)
 {
         unsigned long flags;
 
@@ -91,7 +91,12 @@ static inline void sas_queue_event(int event, spinlock_t *lock,
         }
         __set_bit(event, pending);
         spin_unlock_irqrestore(lock, flags);
-        scsi_queue_work(shost, work);
+
+        spin_lock_irqsave(&sas_ha->state_lock, flags);
+        if (sas_ha->state != SAS_HA_UNREGISTERED) {
+                scsi_queue_work(sas_ha->core.shost, work);
+        }
+        spin_unlock_irqrestore(&sas_ha->state_lock, flags);
 }
 
 static inline void sas_begin_event(int event, spinlock_t *lock,