usbnet: ratelimit kevent may have been dropped warnings

when something goes wrong, a flood of these messages can be generated by usbnet (thousands per second). This doesn't generally *help* the condition so this patch ratelimits the rate of their generation. There's an underlying problem in usbnet's kevent deferral mechanism which needs fixing, specifically that events *can* get dropped and not handled. This patch doesn't address this, but just mitigates fallout caused by the current implemention. Signed-off-by: Steve Glendinning <[email protected]> Signed-off-by: David S. Miller <[email protected]>
kyagi · Nov 9, 2012 · 9532021 · 9532021
1 parent 60713a0
commit 9532021
Showing 1 changed file with 5 additions and 3 deletions.
diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c
@@ -359,10 +359,12 @@ static enum skb_state defer_bh(struct usbnet *dev, struct sk_buff *skb,
 void usbnet_defer_kevent (struct usbnet *dev, int work)
 {
 	set_bit (work, &dev->flags);
-	if (!schedule_work (&dev->kevent))
-		netdev_err(dev->net, "kevent %d may have been dropped\n", work);
-	else
+	if (!schedule_work (&dev->kevent)) {
+		if (net_ratelimit())
+			netdev_err(dev->net, "kevent %d may have been dropped\n", work);
+	} else {
 		netdev_dbg(dev->net, "kevent %d scheduled\n", work);
+	}
 }
 EXPORT_SYMBOL_GPL(usbnet_defer_kevent);