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usbnet: ratelimit kevent may have been dropped warnings

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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 <steve.glendinning@shawell.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Steve Glendinning 2012-11-08 06:26:21 +00:00 committed by David S. Miller
parent 60713a0ca7
commit 9532021da6
1 changed files with 5 additions and 3 deletions
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6
drivers/net/usb/usbnet.c
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@ -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))
if (!schedule_work (&dev->kevent)) {
if (net_ratelimit())
netdev_err(dev->net, "kevent %d may have been dropped\n", work);
else
} else {
netdev_dbg(dev->net, "kevent %d scheduled\n", work);
}
}
EXPORT_SYMBOL_GPL(usbnet_defer_kevent);