netdev - [PATCH 5/5] firewire: net: ratelimit error messages

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Date:	Sun, 28 Nov 2010 03:15:36 +0200
From:	Maxim Levitsky <maximlevitsky@...il.com>
To:	linux1394-devel <linux1394-devel@...ts.sourceforge.net>
Cc:	Stefan Richter <stefanr@...6.in-berlin.de>, netdev@...r.kernel.org,
	Maxim Levitsky <maximlevitsky@...il.com>
Subject: [PATCH 5/5] firewire: net: ratelimit error messages

This patch ensures that firewire-net won't be able to flood
the logs with errors by combining series of same errors together.

Signed-off-by: Maxim Levitsky <maximlevitsky@...il.com>
---
 drivers/firewire/net.c |   16 ++++++++++++----
 1 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/drivers/firewire/net.c b/drivers/firewire/net.c
index d422519..ac563d6 100644
--- a/drivers/firewire/net.c
+++ b/drivers/firewire/net.c
@@ -999,15 +999,23 @@ static void fwnet_transmit_packet_failed(struct fwnet_packet_task *ptask)
 static void fwnet_write_complete(struct fw_card *card, int rcode,
 				 void *payload, size_t length, void *data)
 {
-	struct fwnet_packet_task *ptask;
-
-	ptask = data;
+	struct fwnet_packet_task *ptask = data;
+	static unsigned long j;
+	static int last_rcode, errors_skipped;
 
 	if (rcode == RCODE_COMPLETE) {
 		fwnet_transmit_packet_done(ptask);
 	} else {
-		fw_error("fwnet_write_complete: failed: %x\n", rcode);
 		fwnet_transmit_packet_failed(ptask);
+
+		if (printk_timed_ratelimit(&j,  1000) || rcode != last_rcode) {
+			fw_error("fwnet_write_complete: "
+				"failed: %x (skipped %d)\n", rcode, errors_skipped);
+
+			errors_skipped = 0;
+			last_rcode = rcode;
+		} else
+			errors_skipped++;
 	}
 }
 
-- 
1.7.1

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