1 files changed, 7 insertions, 2 deletions

diff --git a/drivers/s390/scsi/zfcp_fsf.h b/drivers/s390/scsi/zfcp_fsf.h
index b3de682b64cf..4008bd786793 100644
--- a/drivers/s390/scsi/zfcp_fsf.h
+++ b/drivers/s390/scsi/zfcp_fsf.h
@@ -3,7 +3,7 @@
  *
  * Interface to the FSF support functions.
  *
- * Copyright IBM Corporation 2002, 2009
+ * Copyright IBM Corporation 2002, 2010
  */
 
 #ifndef FSF_H
@@ -152,7 +152,12 @@
 #define FSF_CLASS_3                             0x00000003
 
 /* SBAL chaining */
-#define FSF_MAX_SBALS_PER_REQ                   36
+#define ZFCP_FSF_MAX_SBALS_PER_REQ              36
+
+/* max. number of (data buffer) SBALEs in largest SBAL chain
+ * request ID + QTCB in SBALE 0 + 1 of first SBAL in chain   */
+#define ZFCP_FSF_MAX_SBALES_PER_REQ     \
+        (ZFCP_FSF_MAX_SBALS_PER_REQ * ZFCP_QDIO_MAX_SBALES_PER_SBAL - 2)
 
 /* logging space behind QTCB */
 #define FSF_QTCB_LOG_SIZE                       1024