diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c
index 24619c3bebd5..a28d48c850cf 100644
--- a/drivers/scsi/scsi.c
+++ b/drivers/scsi/scsi.c
@@ -214,6 +214,15 @@ void scsi_finish_command(struct scsi_cmnd *cmd)
 	scsi_io_completion(cmd, good_bytes);
 }
 
+
+/*
+ * 1024 is big enough for saturating the fast scsi LUN now
+ */
+static int scsi_device_max_queue_depth(struct scsi_device *sdev)
+{
+	return max_t(int, sdev->host->can_queue, 1024);
+}
+
 /**
  * scsi_change_queue_depth - change a device's queue depth
  * @sdev: SCSI Device in question
@@ -223,6 +232,8 @@ void scsi_finish_command(struct scsi_cmnd *cmd)
  */
 int scsi_change_queue_depth(struct scsi_device *sdev, int depth)
 {
+	depth = min_t(int, depth, scsi_device_max_queue_depth(sdev));
+
 	if (depth > 0) {
 		sdev->queue_depth = depth;
 		wmb();