hpsa: check for ctlr lockup after command allocation in main io path

Command allocation is the thing that takes the longest in the main i/o
path, so check for controller lockup immediately after this to prevent
submitting commands to locked up controller as much as possible.
Reviewed-by: Scott Teel <scott.teel@pmcs.com>
Signed-off-by: Don Brace <don.brace@pmcs.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>

drivers/scsi/hpsa.c

@@ -4097,8 +4097,15 @@ static int hpsa_scsi_queue_command(struct Scsi_Host *sh, struct scsi_cmnd *cmd)
 		dev_err(&h->pdev->dev, "cmd_alloc returned NULL!\n");
 		return SCSI_MLQUEUE_HOST_BUSY;
 	}
+	if (unlikely(lockup_detected(h))) {
+		cmd->result = DID_ERROR << 16;
+		cmd_free(h, c);
+		cmd->scsi_done(cmd);
+		return 0;
+	}
 
-	/* Call alternate submit routine for I/O accelerated commands.
+	/*
+	 * Call alternate submit routine for I/O accelerated commands.
 	 * Retries always go down the normal I/O path.
 	 */
 	if (likely(cmd->retries == 0 &&