merge rml/jejb changes

drivers/scsi/hosts.c

@@ -485,13 +485,6 @@ int scsi_register_host(Scsi_Host_Template *shost_tp)
 
 	BUG_ON(!shost_tp->detect);
 
-	if (!shost_tp->max_sectors) {
-		printk(KERN_WARNING
-		    "scsi HBA driver %s didn't set max_sectors, "
-		    "please fix the template\n", shost_tp->name);
-		shost_tp->max_sectors = 1024;
-	}
-
 	if (!shost_tp->release) {
 		printk(KERN_WARNING
 		    "scsi HBA driver %s didn't set a release method, "

drivers/scsi/scsi.c

@@ -177,6 +177,13 @@ void  scsi_initialize_queue(Scsi_Device * SDpnt, struct Scsi_Host * SHpnt)
 	 */
 	blk_queue_max_phys_segments(q, MAX_PHYS_SEGMENTS);
 
+	if(!SHpnt->max_sectors)
+		/* driver imposes no hard sector transfer limit.
+		 * start at machine infinity initially */
+		SHpnt->max_sectors = SCSI_DEFAULT_MAX_SECTORS;
+
+	/* FIXME: we should also adjust this limit later on
+	 * after we know what the device capabilities are */
 	blk_queue_max_sectors(q, SHpnt->max_sectors);
 
 	if (!SHpnt->use_clustering)

drivers/scsi/scsi.h

@@ -373,6 +373,14 @@ extern const char *const scsi_device_types[MAX_SCSI_DEVICE_CODE];
 #define ASKED_FOR_SENSE 0x20
 #define SYNC_RESET      0x40
 
+/*
+ * This specifies "machine infinity" for host templates which don't
+ * limit the transfer size.  Note this limit represents an absolute
+ * maximum, and may be over the transfer limits allowed for individual
+ * devices (e.g. 256 for SCSI-1)
+ */
+#define SCSI_DEFAULT_MAX_SECTORS	1024
+
 /*
  * This is the crap from the old error handling code.  We have it in a special
  * place so that we can more easily delete it later on.