ipoib: Make ipoib_warn ratelimited

In certain cases it's possible to be flooded by warning messages. To
cope with such situations make the ipoib_warn macro be ratelimited.
To prevent accidental limiting of legitimate, bursty messages make
the limit fairly liberal by allowing up to 100 messages in 10 seconds.

Signed-off-by: Nikolay Borisov <kernel@kyup.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

diff --git a/drivers/infiniband/ulp/ipoib/ipoib.h b/drivers/infiniband/ulp/ipoib/ipoib.h
index 4f7d9b4..7899167 100644 (file)
--- a/drivers/infiniband/ulp/ipoib/ipoib.h
+++ b/drivers/infiniband/ulp/ipoib/ipoib.h
@@ -771,7 +771,13 @@ static inline void ipoib_unregister_debugfs(void) { }
 #define ipoib_printk(level, priv, format, arg...)      \
        printk(level "%s: " format, ((struct ipoib_dev_priv *) priv)->dev->name , ## arg)
 #define ipoib_warn(priv, format, arg...)               \
-       ipoib_printk(KERN_WARNING, priv, format , ## arg)
+do {                                                   \
+       static DEFINE_RATELIMIT_STATE(_rs,              \
+               10 * HZ /*10 seconds */,                \
+               100);           \
+       if (__ratelimit(&_rs))                          \
+               ipoib_printk(KERN_WARNING, priv, format , ## arg);\
+} while (0)
 
 extern int ipoib_sendq_size;
 extern int ipoib_recvq_size;