1 files changed, 9 insertions, 0 deletions

diff --git a/include/scsi/libfc.h b/include/scsi/libfc.h
index e1379b4e8faf..52beadf9a29b 100644
--- a/include/scsi/libfc.h
+++ b/include/scsi/libfc.h
@@ -410,6 +410,12 @@ struct fc_seq {
  * @fh_type:      The frame type
  * @class:        The class of service
  * @seq:          The sequence in use on this exchange
+ * @resp_active:  Number of tasks that are concurrently executing @resp().
+ * @resp_task:    If @resp_active > 0, either the task executing @resp(), the
+ *                task that has been interrupted to execute the soft-IRQ
+ *                executing @resp() or NULL if more than one task is executing
+ *                @resp concurrently.
+ * @resp_wq:      Waitqueue for the tasks waiting on @resp_active.
  * @resp:         Callback for responses on this exchange
  * @destructor:   Called when destroying the exchange
  * @arg:          Passed as a void pointer to the resp() callback
@@ -441,6 +447,9 @@ struct fc_exch {
         u32                 r_a_tov;
         u32                 f_ctl;
         struct fc_seq       seq;
+        int                 resp_active;
+        struct task_struct  *resp_task;
+        wait_queue_head_t   resp_wq;
         void                (*resp)(struct fc_seq *, struct fc_frame *, void *);
         void                *arg;
         void                (*destructor)(struct fc_seq *, void *);