linux-kernel - [PATCH v2] can: m_can: apply rate-limiting to lost msg in rx

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Message-Id: <20250630-mcan_ratelimit-v2-1-6b7a01341ea9@geanix.com>
Date: Mon, 30 Jun 2025 09:52:44 +0200
From: Sean Nyekjaer <sean@...nix.com>
To: Chandrasekar Ramakrishnan <rcsekar@...sung.com>, 
 Marc Kleine-Budde <mkl@...gutronix.de>, 
 Vincent Mailhol <mailhol.vincent@...adoo.fr>, 
 Fengguang Wu <fengguang.wu@...el.com>, 
 Varka Bhadram <varkabhadram@...il.com>, Dong Aisheng <b29396@...escale.com>
Cc: linux-can@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Sean Nyekjaer <sean@...nix.com>
Subject: [PATCH v2] can: m_can: apply rate-limiting to lost msg in rx

Wrap the "msg lost in rxf0" error in m_can_handle_lost_msg() with
a call to net_ratelimit() to prevent flooding the kernel log
with repeated debug messages.

Fixes: e0d1f4816f2a ("can: m_can: add Bosch M_CAN controller support")
Reviewed-by: Vincent Mailhol <mailhol.vincent@...adoo.fr>
Signed-off-by: Sean Nyekjaer <sean@...nix.com>
---
Changes in v2:
- Changed to dbg msg
- Link to v1: https://lore.kernel.org/r/20250620-mcan_ratelimit-v1-1-e747ee30f71f@geanix.com
---
 drivers/net/can/m_can/m_can.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c
index 6c656bfdb3235e1f5d6405c49b07b821ddacc1b9..9f43111609d364c01c6df10489fc4708deab9fbb 100644
--- a/drivers/net/can/m_can/m_can.c
+++ b/drivers/net/can/m_can/m_can.c
@@ -665,7 +665,8 @@ static int m_can_handle_lost_msg(struct net_device *dev)
 	struct can_frame *frame;
 	u32 timestamp = 0;
 
-	netdev_err(dev, "msg lost in rxf0\n");
+	if (net_ratelimit())
+		netdev_dbg(dev, "msg lost in rxf0\n");
 
 	stats->rx_errors++;
 	stats->rx_over_errors++;

---
base-commit: db22720545207f734aaa9d9f71637bfc8b0155e0
change-id: 20250620-mcan_ratelimit-e7e1f9d8fa9c

Best regards,
-- 
Sean Nyekjaer <sean@...nix.com>