[SCSI] update max sdev block limit

Updated patch to address comments from Pat Mansfield and Michael Reed:
Bumped max to 600 (10mins). Set default dev_loss_tmo to a value other
than the max (30s).

Signed-off-by: James Smart <James.Smart@emulex.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
diff --git a/drivers/scsi/scsi_priv.h b/drivers/scsi/scsi_priv.h
index a1727a0..117c233 100644
--- a/drivers/scsi/scsi_priv.h
+++ b/drivers/scsi/scsi_priv.h
@@ -117,7 +117,7 @@
  * classes.
  */
 
-#define SCSI_DEVICE_BLOCK_MAX_TIMEOUT	(HZ*60)
+#define SCSI_DEVICE_BLOCK_MAX_TIMEOUT	600	/* units in seconds */
 extern int scsi_internal_device_block(struct scsi_device *sdev);
 extern int scsi_internal_device_unblock(struct scsi_device *sdev);