[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, 8 insertions, 0 deletions

diff --git a/include/scsi/libsas.h b/include/scsi/libsas.h
index c83426344e8f..ca393929c10b 100644
--- a/include/scsi/libsas.h
+++ b/include/scsi/libsas.h
@@ -323,12 +323,20 @@ struct sas_ha_event {
         struct sas_ha_struct *ha;
 };
 
+enum sas_ha_state {
+        SAS_HA_REGISTERED,
+        SAS_HA_UNREGISTERED
+};
+
 struct sas_ha_struct {
 /* private: */
         spinlock_t       event_lock;
         struct sas_ha_event ha_events[HA_NUM_EVENTS];
         unsigned long    pending;
 
+        enum sas_ha_state state;
+        spinlock_t        state_lock;
+
         struct scsi_core core;
 
 /* public: */