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-rw-r--r--include/scsi/libiscsi.h17
1 files changed, 12 insertions, 5 deletions
diff --git a/include/scsi/libiscsi.h b/include/scsi/libiscsi.h
index 1457c26dfc58..728c9ad9feb0 100644
--- a/include/scsi/libiscsi.h
+++ b/include/scsi/libiscsi.h
@@ -331,12 +331,19 @@ struct iscsi_session {
struct iscsi_transport *tt;
struct Scsi_Host *host;
struct iscsi_conn *leadconn; /* leading connection */
- spinlock_t lock; /* protects session state, *
- * sequence numbers, *
+ /* Between the forward and the backward locks exists a strict locking
+ * hierarchy. The mutual exclusion zone protected by the forward lock
+ * can enclose the mutual exclusion zone protected by the backward lock
+ * but not vice versa.
+ */
+ spinlock_t frwd_lock; /* protects session state, *
+ * cmdsn, queued_cmdsn *
* session resources: *
- * - cmdpool, *
- * - mgmtpool, *
- * - r2tpool */
+ * - cmdpool kfifo_out , *
+ * - mgmtpool, */
+ spinlock_t back_lock; /* protects cmdsn_exp *
+ * cmdsn_max, *
+ * cmdpool kfifo_in */
int state; /* session state */
int age; /* counts session re-opens */