linux-kernel - [PATCH 056/118] net: rate-limit warn-bad-offload splats.

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Date:	Tue,  7 May 2013 14:38:22 +0100
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Ben Greear <greearb@...delatech.com>,
	"David S. Miller" <davem@...emloft.net>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 056/118] net: rate-limit warn-bad-offload splats.

3.5.7.12 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Ben Greear <greearb@...delatech.com>

commit c846ad9b880ece01bb4d8d07ba917734edf0324f upstream.

If one does do something unfortunate and allow a
bad offload bug into the kernel, this the
skb_warn_bad_offload can effectively live-lock the
system, filling the logs with the same error over
and over.

Add rate limitation to this so that box remains otherwise
functional in this case.

Signed-off-by: Ben Greear <greearb@...delatech.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 net/core/dev.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/core/dev.c b/net/core/dev.c
index 196bc5f..ba9d7a7 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1893,6 +1893,9 @@ static void skb_warn_bad_offload(const struct sk_buff *skb)
 	struct net_device *dev = skb->dev;
 	const char *driver = "";
 
+	if (!net_ratelimit())
+		return;
+
 	if (dev && dev->dev.parent)
 		driver = dev_driver_string(dev->dev.parent);
 
-- 
1.8.1.2

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