linux-kernel - [PATCH v2 10/12] can: sun4i_can: fix {rx,tx}

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Message-ID: <20241122221650.633981-11-dario.binacchi@amarulasolutions.com>
Date: Fri, 22 Nov 2024 23:15:51 +0100
From: Dario Binacchi <dario.binacchi@...rulasolutions.com>
To: linux-kernel@...r.kernel.org
Cc: linux-amarula@...rulasolutions.com,
	Dario Binacchi <dario.binacchi@...rulasolutions.com>,
	Chen-Yu Tsai <wens@...e.org>,
	Gerhard Bertelsmann <info@...hard-bertelsmann.de>,
	Jernej Skrabec <jernej.skrabec@...il.com>,
	Marc Kleine-Budde <mkl@...gutronix.de>,
	Maxime Ripard <mripard@...nel.org>,
	Samuel Holland <samuel@...lland.org>,
	Vincent Mailhol <mailhol.vincent@...adoo.fr>,
	linux-arm-kernel@...ts.infradead.org,
	linux-can@...r.kernel.org,
	linux-sunxi@...ts.linux.dev
Subject: [PATCH v2 10/12] can: sun4i_can: fix {rx,tx}_errors statistics

The sun4i_can_err() function only incremented the receive error counter
and never the transmit error counter, even if the STA_ERR_DIR flag
reported that an error had occurred during transmission. Increment the
receive/transmit error counter based on the value of the STA_ERR_DIR
flag.

Fixes: 0738eff14d81 ("can: Allwinner A10/A20 CAN Controller support - Kernel module")
Signed-off-by: Dario Binacchi <dario.binacchi@...rulasolutions.com>

---

Changes in v2:
- Update statistics even if skb allocation fails

 drivers/net/can/sun4i_can.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/net/can/sun4i_can.c b/drivers/net/can/sun4i_can.c
index 840b972498c1..5285bb0b7c69 100644
--- a/drivers/net/can/sun4i_can.c
+++ b/drivers/net/can/sun4i_can.c
@@ -579,7 +579,6 @@ static int sun4i_can_err(struct net_device *dev, u8 isrc, u8 status)
 		/* bus error interrupt */
 		netdev_dbg(dev, "bus error interrupt\n");
 		priv->can.can_stats.bus_error++;
-		stats->rx_errors++;
 
 		if (likely(skb)) {
 			ecc = readl(priv->base + SUN4I_REG_STA_ADDR);
@@ -601,9 +600,15 @@ static int sun4i_can_err(struct net_device *dev, u8 isrc, u8 status)
 					       >> 16;
 				break;
 			}
-			/* error occurred during transmission? */
-			if ((ecc & SUN4I_STA_ERR_DIR) == 0)
+		}
+
+		/* error occurred during transmission? */
+		if ((ecc & SUN4I_STA_ERR_DIR) == 0) {
+			if (likely(skb))
 				cf->data[2] |= CAN_ERR_PROT_TX;
+			stats->tx_errors++;
+		} else {
+			stats->rx_errors++;
 		}
 	}
 	if (isrc & SUN4I_INT_ERR_PASSIVE) {
-- 
2.43.0