From 637c50bd04f96106cea7fce4cb318fe1f1380af8 Mon Sep 17 00:00:00 2001
From: t_jeang <devnull@localhost>
Date: Tue, 6 Jan 2009 12:06:01 +0000
Subject: [PATCH] imported patch ratelimit-blktap-wprintk

---
 drivers/xen/blktap/blktap.c | 6 ++++++
 drivers/xen/blktap/common.h | 6 +++++-
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/xen/blktap/blktap.c b/drivers/xen/blktap/blktap.c
index 581f551e..f27c02f7 100644
--- a/drivers/xen/blktap/blktap.c
+++ b/drivers/xen/blktap/blktap.c
@@ -1125,6 +1125,12 @@ static int do_block_io_op(tap_blkif_t *info)
 			msleep(1);
 			WPRINTK("unknown operation [%d]\n",
 				req.operation);
+			WPRINTK("req_prod: 0x%08x, req_cons: 0x%08x, "
+				"rsp_prod: 0x%08x, rsp_prod_pvt: 0x%08x\n",
+				blk_rings->common.sring->req_prod,
+				blk_rings->common.req_cons,
+				blk_rings->common.sring->rsp_prod,
+				blk_rings->common.rsp_prod_pvt);
 			make_response(blkif, req.id, req.operation,
 				      BLKIF_RSP_ERROR);
 			free_req(pending_req);
diff --git a/drivers/xen/blktap/common.h b/drivers/xen/blktap/common.h
index 6168d512..134e50cd 100644
--- a/drivers/xen/blktap/common.h
+++ b/drivers/xen/blktap/common.h
@@ -45,7 +45,11 @@
 #define DPRINTK(_f, _a...) pr_debug("(file=%s, line=%d) " _f, \
                                     __FILE__ , __LINE__ , ## _a )
 
-#define WPRINTK(fmt, args...) printk(KERN_WARNING "blk_tap: " fmt, ##args)
+#define WPRINTK(fmt, args...)                                         \
+do {                                                                  \
+	if (printk_ratelimit())                                       \
+		printk(KERN_WARNING "blk_tap: " fmt, ##args);         \
+} while (0)
 
 struct backend_info;
 
-- 
2.39.5