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

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Date:	Mon, 29 Nov 2010 04:09:53 +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

Unfortunelly its easy to trigger such error messages
by removing the cable while sending streams of data
over the link.

Such errors are normal, and therefore this patch
stops firewire-net from flooding the kernel log
with these 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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