Upgrade to 4.4.50-rt62

[kvmfornfv.git] / kernel / drivers / s390 / scsi / zfcp_reqlist.h

diff --git a/kernel/drivers/s390/scsi/zfcp_reqlist.h b/kernel/drivers/s390/scsi/zfcp_reqlist.h
index 7c2c619..703fce5 100644 (file)
--- a/kernel/drivers/s390/scsi/zfcp_reqlist.h
+++ b/kernel/drivers/s390/scsi/zfcp_reqlist.h
@@ -4,7 +4,7 @@
  * Data structure and helper functions for tracking pending FSF
  * requests.
  *
- * Copyright IBM Corp. 2009
+ * Copyright IBM Corp. 2009, 2016
  */
 
 #ifndef ZFCP_REQLIST_H
@@ -180,4 +180,32 @@ static inline void zfcp_reqlist_move(struct zfcp_reqlist *rl,
        spin_unlock_irqrestore(&rl->lock, flags);
 }
 
+/**
+ * zfcp_reqlist_apply_for_all() - apply a function to every request.
+ * @rl: the requestlist that contains the target requests.
+ * @f: the function to apply to each request; the first parameter of the
+ *     function will be the target-request; the second parameter is the same
+ *     pointer as given with the argument @data.
+ * @data: freely chosen argument; passed through to @f as second parameter.
+ *
+ * Uses :c:macro:`list_for_each_entry` to iterate over the lists in the hash-
+ * table (not a 'safe' variant, so don't modify the list).
+ *
+ * Holds @rl->lock over the entire request-iteration.
+ */
+static inline void
+zfcp_reqlist_apply_for_all(struct zfcp_reqlist *rl,
+                          void (*f)(struct zfcp_fsf_req *, void *), void *data)
+{
+       struct zfcp_fsf_req *req;
+       unsigned long flags;
+       unsigned int i;
+
+       spin_lock_irqsave(&rl->lock, flags);
+       for (i = 0; i < ZFCP_REQ_LIST_BUCKETS; i++)
+               list_for_each_entry(req, &rl->buckets[i], list)
+                       f(req, data);
+       spin_unlock_irqrestore(&rl->lock, flags);
+}
+
 #endif /* ZFCP_REQLIST_H */