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-rw-r--r--include/scsi/scsi_host.h8
1 files changed, 6 insertions, 2 deletions
diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h
index d1299e99972..530ff4c553f 100644
--- a/include/scsi/scsi_host.h
+++ b/include/scsi/scsi_host.h
@@ -6,6 +6,7 @@
#include <linux/types.h>
#include <linux/workqueue.h>
#include <linux/mutex.h>
+#include <scsi/scsi.h>
struct request_queue;
struct block_device;
@@ -25,12 +26,15 @@ struct blk_queue_tags;
* NONE: Self evident. Host adapter is not capable of scatter-gather.
* ALL: Means that the host adapter module can do scatter-gather,
* and that there is no limit to the size of the table to which
- * we scatter/gather data.
+ * we scatter/gather data. The value we set here is the maximum
+ * single element sglist. To use chained sglists, the adapter
+ * has to set a value beyond ALL (and correctly use the chain
+ * handling API.
* Anything else: Indicates the maximum number of chains that can be
* used in one scatter-gather request.
*/
#define SG_NONE 0
-#define SG_ALL 0xff
+#define SG_ALL SCSI_MAX_SG_SEGMENTS
#define MODE_UNKNOWN 0x00
#define MODE_INITIATOR 0x01