1 files changed, 19 insertions, 5 deletions

diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h
index 81d5234f6771..ac1b6125e3ae 100644
--- a/include/scsi/scsi_host.h
+++ b/include/scsi/scsi_host.h
@@ -429,12 +429,15 @@ struct scsi_host_template {
 };
 
 /*
- * shost states
+ * shost state: If you alter this, you also need to alter scsi_sysfs.c
+ * (for the ascii descriptions) and the state model enforcer:
+ * scsi_host_set_state()
  */
-enum {
-        SHOST_ADD,
-        SHOST_DEL,
+enum scsi_host_state {
+        SHOST_CREATED = 1,
+        SHOST_RUNNING,
         SHOST_CANCEL,
+        SHOST_DEL,
         SHOST_RECOVERY,
 };
 
@@ -575,7 +578,7 @@ struct Scsi_Host {
         unsigned int  irq;
         
 
-        unsigned long shost_state;
+        enum scsi_host_state shost_state;
 
         /* ldm bits */
         struct device           shost_gendev;
@@ -633,6 +636,7 @@ extern void scsi_remove_host(struct Scsi_Host *);
 extern struct Scsi_Host *scsi_host_get(struct Scsi_Host *);
 extern void scsi_host_put(struct Scsi_Host *t);
 extern struct Scsi_Host *scsi_host_lookup(unsigned short);
+extern const char *scsi_host_state_name(enum scsi_host_state);
 
 extern u64 scsi_calculate_bounce_limit(struct Scsi_Host *);
 
@@ -646,6 +650,15 @@ static inline struct device *scsi_get_device(struct Scsi_Host *shost)
         return shost->shost_gendev.parent;
 }
 
+/**
+ * scsi_host_scan_allowed - Is scanning of this host allowed
+ * @shost:      Pointer to Scsi_Host.
+ **/
+static inline int scsi_host_scan_allowed(struct Scsi_Host *shost)
+{
+        return shost->shost_state == SHOST_RUNNING;
+}
+
 extern void scsi_unblock_requests(struct Scsi_Host *);
 extern void scsi_block_requests(struct Scsi_Host *);
 
@@ -663,5 +676,6 @@ extern struct scsi_device *scsi_get_host_dev(struct Scsi_Host *);
 /* legacy interfaces */
 extern struct Scsi_Host *scsi_register(struct scsi_host_template *, int);
 extern void scsi_unregister(struct Scsi_Host *);
+extern int scsi_host_set_state(struct Scsi_Host *, enum scsi_host_state);
 
 #endif /* _SCSI_SCSI_HOST_H */