7813 mpt_sas does not like concurrent HBA resets

*** 935,944 ****
--- 935,949 ----
           * Is HBA processing a diag reset?
           */
          uint8_t                 m_in_reset;
  
          /*
+          * Task management protection
+          */
+         kmutex_t                m_taskmgmt_mutex;
+ 
+         /*
           * per instance cmd data structures for task management cmds
           */
          m_event_struct_t        m_event_task_mgmt;      /* must be last */
                                                          /* ... scsi_pkt_size */
  } mptsas_t;
*** 1330,1340 ****
      uint16_t dev_handle, int lun, uint8_t *reply, uint32_t reply_size,
      int mode);
  int mptsas_send_event_ack(mptsas_t *mpt, uint32_t event, uint32_t eventcntx);
  void mptsas_send_pending_event_ack(mptsas_t *mpt);
  void mptsas_set_throttle(struct mptsas *mpt, mptsas_target_t *ptgt, int what);
! int mptsas_restart_ioc(mptsas_t *mpt);
  void mptsas_update_driver_data(struct mptsas *mpt);
  uint64_t mptsas_get_sata_guid(mptsas_t *mpt, mptsas_target_t *ptgt, int lun);
  
  /*
   * init functions
--- 1335,1345 ----
      uint16_t dev_handle, int lun, uint8_t *reply, uint32_t reply_size,
      int mode);
  int mptsas_send_event_ack(mptsas_t *mpt, uint32_t event, uint32_t eventcntx);
  void mptsas_send_pending_event_ack(mptsas_t *mpt);
  void mptsas_set_throttle(struct mptsas *mpt, mptsas_target_t *ptgt, int what);
! int mptsas_reset_handler(mptsas_t *mpt);
  void mptsas_update_driver_data(struct mptsas *mpt);
  uint64_t mptsas_get_sata_guid(mptsas_t *mpt, mptsas_target_t *ptgt, int lun);
  
  /*
   * init functions