Merge tag 'linux-can-next-for-6.14-20250110' of git://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can-next

Marc Kleine-Budde says:

====================
pull-request: can-next 2025-01-10

Pierre-Henry Moussay adds PIC64GX compatibility to the DT bindings for
Microchip's mpfs-can IP core.

The next 3 patches are by Sean Nyekjaer and target the tcan4x5x
driver. First the DT bindings is converted to DT schema, then nWKRQ
voltage selection is added to the driver.

Dario Binacchi's patch for the sun4i_can makes the driver more
consistent by adding a likely() to the driver.

Another patch by Sean Nyekjaer for the tcan4x5x driver gets rid of a
false error message.

Charan Pedumuru converts the atmel-can DT bindings to DT schema.

The next 2 patches are by Oliver Hartkopp. The first one maps Oliver's
former mail addresses to a dedicated CAN mail address. The second one
assigns net/sched/em_canid.c additionally to the CAN maintainers.

Ariel Otilibili's patch removes dead code from the CAN dev helper.

The next 3 patches are by Sean Nyekjaer and add HW standby support to
the tcan4x5x driver.

A patch by Dario Binacchi fixes the DT bindings for the st,stm32-bxcan
driver.

The last 4 patches are by Jimmy Assarsson and target the kvaser_usb
and the kvaser_pciefd driver: error statistics are improved and
CAN_CTRLMODE_BERR_REPORTING is added.

* tag 'linux-can-next-for-6.14-20250110' of git://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can-next:
  can: kvaser_pciefd: Add support for CAN_CTRLMODE_BERR_REPORTING
  can: kvaser_pciefd: Update stats and state even if alloc_can_err_skb() fails
  can: kvaser_usb: Add support for CAN_CTRLMODE_BERR_REPORTING
  can: kvaser_usb: Update stats and state even if alloc_can_err_skb() fails
  dt-bindings: can: st,stm32-bxcan: fix st,gcan property type
  can: m_can: call deinit/init callback when going into suspend/resume
  can: tcan4x5x: add deinit callback to set standby mode
  can: m_can: add deinit callback
  can: dev: can_get_state_str(): Remove dead code
  MAINTAINERS: assign em_canid.c additionally to CAN maintainers
  mailmap: add an entry for Oliver Hartkopp
  dt-bindings: net: can: atmel: Convert to json schema
  can: tcan4x5x: get rid of false clock errors
  can: sun4i_can: continue to use likely() to check skb
  can: tcan4x5x: add option for selecting nWKRQ voltage
  dt-bindings: can: tcan4x5x: Document the ti,nwkrq-voltage-vio option
  dt-bindings: can: convert tcan4x5x.txt to DT schema
  dt-bindings: can: mpfs: add PIC64GX CAN compatibility
====================

Link: https://patch.msgid.link/20250110112712.3214173-1-mkl@pengutronix.de
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

10 files changed, 166 insertions, 148 deletions

diff --git a/drivers/net/can/dev/dev.c b/drivers/net/can/dev/dev.c
index 681643ab3780..5ec3170b896a 100644
--- a/drivers/net/can/dev/dev.c
+++ b/drivers/net/can/dev/dev.c
@@ -85,8 +85,6 @@ const char *can_get_state_str(const enum can_state state)
 	default:
 		return "<unknown>";
 	}
-
-	return "<unknown>";
 }
 EXPORT_SYMBOL_GPL(can_get_state_str);
 
diff --git a/drivers/net/can/kvaser_pciefd.c b/drivers/net/can/kvaser_pciefd.c
index fee012b57f33..fa04a7ced02b 100644
--- a/drivers/net/can/kvaser_pciefd.c
+++ b/drivers/net/can/kvaser_pciefd.c
@@ -999,7 +999,8 @@ static int kvaser_pciefd_setup_can_ctrls(struct kvaser_pciefd *pcie)
 		can->can.ctrlmode_supported = CAN_CTRLMODE_LISTENONLY |
 					      CAN_CTRLMODE_FD |
 					      CAN_CTRLMODE_FD_NON_ISO |
-					      CAN_CTRLMODE_CC_LEN8_DLC;
+					      CAN_CTRLMODE_CC_LEN8_DLC |
+					      CAN_CTRLMODE_BERR_REPORTING;
 
 		status = ioread32(can->reg_base + KVASER_PCIEFD_KCAN_STAT_REG);
 		if (!(status & KVASER_PCIEFD_KCAN_STAT_FD)) {
@@ -1234,11 +1235,15 @@ static int kvaser_pciefd_handle_data_packet(struct kvaser_pciefd *pcie,
 }
 
 static void kvaser_pciefd_change_state(struct kvaser_pciefd_can *can,
+				       const struct can_berr_counter *bec,
 				       struct can_frame *cf,
 				       enum can_state new_state,
 				       enum can_state tx_state,
 				       enum can_state rx_state)
 {
+	enum can_state old_state;
+
+	old_state = can->can.state;
 	can_change_state(can->can.dev, cf, tx_state, rx_state);
 
 	if (new_state == CAN_STATE_BUS_OFF) {
@@ -1254,6 +1259,18 @@ static void kvaser_pciefd_change_state(struct kvaser_pciefd_can *can,
 			can_bus_off(ndev);
 		}
 	}
+	if (old_state == CAN_STATE_BUS_OFF &&
+	    new_state == CAN_STATE_ERROR_ACTIVE &&
+	    can->can.restart_ms) {
+		can->can.can_stats.restarts++;
+		if (cf)
+			cf->can_id |= CAN_ERR_RESTARTED;
+	}
+	if (cf && new_state != CAN_STATE_BUS_OFF) {
+		cf->can_id |= CAN_ERR_CNT;
+		cf->data[6] = bec->txerr;
+		cf->data[7] = bec->rxerr;
+	}
 }
 
 static void kvaser_pciefd_packet_to_state(struct kvaser_pciefd_rx_packet *p,
@@ -1288,7 +1305,7 @@ static int kvaser_pciefd_rx_error_frame(struct kvaser_pciefd_can *can,
 	struct can_berr_counter bec;
 	enum can_state old_state, new_state, tx_state, rx_state;
 	struct net_device *ndev = can->can.dev;
-	struct sk_buff *skb;
+	struct sk_buff *skb = NULL;
 	struct can_frame *cf = NULL;
 
 	old_state = can->can.state;
@@ -1297,16 +1314,10 @@ static int kvaser_pciefd_rx_error_frame(struct kvaser_pciefd_can *can,
 	bec.rxerr = FIELD_GET(KVASER_PCIEFD_SPACK_RXERR_MASK, p->header[0]);
 
 	kvaser_pciefd_packet_to_state(p, &bec, &new_state, &tx_state, &rx_state);
-	skb = alloc_can_err_skb(ndev, &cf);
+	if (can->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING)
+		skb = alloc_can_err_skb(ndev, &cf);
 	if (new_state != old_state) {
-		kvaser_pciefd_change_state(can, cf, new_state, tx_state, rx_state);
-		if (old_state == CAN_STATE_BUS_OFF &&
-		    new_state == CAN_STATE_ERROR_ACTIVE &&
-		    can->can.restart_ms) {
-			can->can.can_stats.restarts++;
-			if (skb)
-				cf->can_id |= CAN_ERR_RESTARTED;
-		}
+		kvaser_pciefd_change_state(can, &bec, cf, new_state, tx_state, rx_state);
 	}
 
 	can->err_rep_cnt++;
@@ -1319,18 +1330,19 @@ static int kvaser_pciefd_rx_error_frame(struct kvaser_pciefd_can *can,
 	can->bec.txerr = bec.txerr;
 	can->bec.rxerr = bec.rxerr;
 
-	if (!skb) {
-		ndev->stats.rx_dropped++;
-		return -ENOMEM;
+	if (can->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING) {
+		if (!skb) {
+			netdev_warn(ndev, "No memory left for err_skb\n");
+			ndev->stats.rx_dropped++;
+			return -ENOMEM;
+		}
+		kvaser_pciefd_set_skb_timestamp(can->kv_pcie, skb, p->timestamp);
+		cf->can_id |= CAN_ERR_BUSERROR | CAN_ERR_CNT;
+		cf->data[6] = bec.txerr;
+		cf->data[7] = bec.rxerr;
+		netif_rx(skb);
 	}
 
-	kvaser_pciefd_set_skb_timestamp(can->kv_pcie, skb, p->timestamp);
-	cf->can_id |= CAN_ERR_BUSERROR | CAN_ERR_CNT;
-	cf->data[6] = bec.txerr;
-	cf->data[7] = bec.rxerr;
-
-	netif_rx(skb);
-
 	return 0;
 }
 
@@ -1359,6 +1371,7 @@ static int kvaser_pciefd_handle_status_resp(struct kvaser_pciefd_can *can,
 {
 	struct can_berr_counter bec;
 	enum can_state old_state, new_state, tx_state, rx_state;
+	int ret = 0;
 
 	old_state = can->can.state;
 
@@ -1372,25 +1385,15 @@ static int kvaser_pciefd_handle_status_resp(struct kvaser_pciefd_can *can,
 		struct can_frame *cf;
 
 		skb = alloc_can_err_skb(ndev, &cf);
-		if (!skb) {
+		kvaser_pciefd_change_state(can, &bec, cf, new_state, tx_state, rx_state);
+		if (skb) {
+			kvaser_pciefd_set_skb_timestamp(can->kv_pcie, skb, p->timestamp);
+			netif_rx(skb);
+		} else {
 			ndev->stats.rx_dropped++;
-			return -ENOMEM;
+			netdev_warn(ndev, "No memory left for err_skb\n");
+			ret = -ENOMEM;
 		}
-
-		kvaser_pciefd_change_state(can, cf, new_state, tx_state, rx_state);
-		if (old_state == CAN_STATE_BUS_OFF &&
-		    new_state == CAN_STATE_ERROR_ACTIVE &&
-		    can->can.restart_ms) {
-			can->can.can_stats.restarts++;
-			cf->can_id |= CAN_ERR_RESTARTED;
-		}
-
-		kvaser_pciefd_set_skb_timestamp(can->kv_pcie, skb, p->timestamp);
-
-		cf->data[6] = bec.txerr;
-		cf->data[7] = bec.rxerr;
-
-		netif_rx(skb);
 	}
 	can->bec.txerr = bec.txerr;
 	can->bec.rxerr = bec.rxerr;
@@ -1398,7 +1401,7 @@ static int kvaser_pciefd_handle_status_resp(struct kvaser_pciefd_can *can,
 	if (bec.txerr || bec.rxerr)
 		mod_timer(&can->bec_poll_timer, KVASER_PCIEFD_BEC_POLL_FREQ);
 
-	return 0;
+	return ret;
 }
 
 static int kvaser_pciefd_handle_status_packet(struct kvaser_pciefd *pcie,
diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c
index 97cd8bbf2e32..d025d4163fd1 100644
--- a/drivers/net/can/m_can/m_can.c
+++ b/drivers/net/can/m_can/m_can.c
@@ -1785,6 +1785,13 @@ static void m_can_stop(struct net_device *dev)
 
 	/* set the state as STOPPED */
 	cdev->can.state = CAN_STATE_STOPPED;
+
+	if (cdev->ops->deinit) {
+		ret = cdev->ops->deinit(cdev);
+		if (ret)
+			netdev_err(dev, "failed to deinitialize: %pe\n",
+				   ERR_PTR(ret));
+	}
 }
 
 static int m_can_close(struct net_device *dev)
@@ -2466,6 +2473,7 @@ int m_can_class_suspend(struct device *dev)
 {
 	struct m_can_classdev *cdev = dev_get_drvdata(dev);
 	struct net_device *ndev = cdev->net;
+	int ret = 0;
 
 	if (netif_running(ndev)) {
 		netif_stop_queue(ndev);
@@ -2478,6 +2486,9 @@ int m_can_class_suspend(struct device *dev)
 		if (cdev->pm_wake_source) {
 			hrtimer_cancel(&cdev->hrtimer);
 			m_can_write(cdev, M_CAN_IE, IR_RF0N);
+
+			if (cdev->ops->deinit)
+				ret = cdev->ops->deinit(cdev);
 		} else {
 			m_can_stop(ndev);
 		}
@@ -2489,7 +2500,7 @@ int m_can_class_suspend(struct device *dev)
 
 	cdev->can.state = CAN_STATE_SLEEPING;
 
-	return 0;
+	return ret;
 }
 EXPORT_SYMBOL_GPL(m_can_class_suspend);
 
@@ -2497,14 +2508,13 @@ int m_can_class_resume(struct device *dev)
 {
 	struct m_can_classdev *cdev = dev_get_drvdata(dev);
 	struct net_device *ndev = cdev->net;
+	int ret = 0;
 
 	pinctrl_pm_select_default_state(dev);
 
 	cdev->can.state = CAN_STATE_ERROR_ACTIVE;
 
 	if (netif_running(ndev)) {
-		int ret;
-
 		ret = m_can_clk_start(cdev);
 		if (ret)
 			return ret;
@@ -2517,6 +2527,10 @@ int m_can_class_resume(struct device *dev)
 			 * again.
 			 */
 			cdev->active_interrupts |= IR_RF0N | IR_TEFN;
+
+			if (cdev->ops->init)
+				ret = cdev->ops->init(cdev);
+
 			m_can_write(cdev, M_CAN_IE, cdev->active_interrupts);
 		} else {
 			ret  = m_can_start(ndev);
@@ -2530,7 +2544,7 @@ int m_can_class_resume(struct device *dev)
 		netif_start_queue(ndev);
 	}
 
-	return 0;
+	return ret;
 }
 EXPORT_SYMBOL_GPL(m_can_class_resume);
 
diff --git a/drivers/net/can/m_can/m_can.h b/drivers/net/can/m_can/m_can.h
index ef39e8e527ab..bd4746c63af3 100644
--- a/drivers/net/can/m_can/m_can.h
+++ b/drivers/net/can/m_can/m_can.h
@@ -68,6 +68,7 @@ struct m_can_ops {
 	int (*write_fifo)(struct m_can_classdev *cdev, int addr_offset,
 			  const void *val, size_t val_count);
 	int (*init)(struct m_can_classdev *cdev);
+	int (*deinit)(struct m_can_classdev *cdev);
 };
 
 struct m_can_tx_op {
diff --git a/drivers/net/can/m_can/tcan4x5x-core.c b/drivers/net/can/m_can/tcan4x5x-core.c
index 2f73bf3abad8..e5c162f8c589 100644
--- a/drivers/net/can/m_can/tcan4x5x-core.c
+++ b/drivers/net/can/m_can/tcan4x5x-core.c
@@ -92,6 +92,8 @@
 #define TCAN4X5X_MODE_STANDBY BIT(6)
 #define TCAN4X5X_MODE_NORMAL BIT(7)
 
+#define TCAN4X5X_NWKRQ_VOLTAGE_VIO BIT(19)
+
 #define TCAN4X5X_DISABLE_WAKE_MSK	(BIT(31) | BIT(30))
 #define TCAN4X5X_DISABLE_INH_MSK	BIT(9)
 
@@ -267,9 +269,24 @@ static int tcan4x5x_init(struct m_can_classdev *cdev)
 	if (ret)
 		return ret;
 
+	if (tcan4x5x->nwkrq_voltage_vio) {
+		ret = regmap_set_bits(tcan4x5x->regmap, TCAN4X5X_CONFIG,
+				      TCAN4X5X_NWKRQ_VOLTAGE_VIO);
+		if (ret)
+			return ret;
+	}
+
 	return ret;
 }
 
+static int tcan4x5x_deinit(struct m_can_classdev *cdev)
+{
+	struct tcan4x5x_priv *tcan4x5x = cdev_to_priv(cdev);
+
+	return regmap_update_bits(tcan4x5x->regmap, TCAN4X5X_CONFIG,
+				  TCAN4X5X_MODE_SEL_MASK, TCAN4X5X_MODE_STANDBY);
+};
+
 static int tcan4x5x_disable_wake(struct m_can_classdev *cdev)
 {
 	struct tcan4x5x_priv *tcan4x5x = cdev_to_priv(cdev);
@@ -318,6 +335,14 @@ static const struct tcan4x5x_version_info
 	return &tcan4x5x_versions[TCAN4X5X];
 }
 
+static void tcan4x5x_get_dt_data(struct m_can_classdev *cdev)
+{
+	struct tcan4x5x_priv *tcan4x5x = cdev_to_priv(cdev);
+
+	tcan4x5x->nwkrq_voltage_vio =
+		of_property_read_bool(cdev->dev->of_node, "ti,nwkrq-voltage-vio");
+}
+
 static int tcan4x5x_get_gpios(struct m_can_classdev *cdev,
 			      const struct tcan4x5x_version_info *version_info)
 {
@@ -359,6 +384,7 @@ static int tcan4x5x_get_gpios(struct m_can_classdev *cdev,
 
 static const struct m_can_ops tcan4x5x_ops = {
 	.init = tcan4x5x_init,
+	.deinit = tcan4x5x_deinit,
 	.read_reg = tcan4x5x_read_reg,
 	.write_reg = tcan4x5x_write_reg,
 	.write_fifo = tcan4x5x_write_fifo,
@@ -392,7 +418,7 @@ static int tcan4x5x_can_probe(struct spi_device *spi)
 		priv->power = NULL;
 	}
 
-	m_can_class_get_clocks(mcan_class);
+	mcan_class->cclk = devm_clk_get(mcan_class->dev, "cclk");
 	if (IS_ERR(mcan_class->cclk)) {
 		dev_err(&spi->dev, "no CAN clock source defined\n");
 		freq = TCAN4X5X_EXT_CLK_DEF;
@@ -453,6 +479,8 @@ static int tcan4x5x_can_probe(struct spi_device *spi)
 		goto out_power;
 	}
 
+	tcan4x5x_get_dt_data(mcan_class);
+
 	tcan4x5x_check_wake(priv);
 
 	ret = tcan4x5x_write_tcan_reg(mcan_class, TCAN4X5X_INT_EN, 0);
diff --git a/drivers/net/can/m_can/tcan4x5x.h b/drivers/net/can/m_can/tcan4x5x.h
index e62c030d3e1e..203399d5e8cc 100644
--- a/drivers/net/can/m_can/tcan4x5x.h
+++ b/drivers/net/can/m_can/tcan4x5x.h
@@ -42,6 +42,8 @@ struct tcan4x5x_priv {
 
 	struct tcan4x5x_map_buf map_buf_rx;
 	struct tcan4x5x_map_buf map_buf_tx;
+
+	bool nwkrq_voltage_vio;
 };
 
 static inline void
diff --git a/drivers/net/can/sun4i_can.c b/drivers/net/can/sun4i_can.c
index 4311c1f0eafd..6fcb301ef611 100644
--- a/drivers/net/can/sun4i_can.c
+++ b/drivers/net/can/sun4i_can.c
@@ -570,7 +570,7 @@ static int sun4i_can_err(struct net_device *dev, u8 isrc, u8 status)
 		else
 			state = CAN_STATE_ERROR_ACTIVE;
 	}
-	if (skb && state != CAN_STATE_BUS_OFF) {
+	if (likely(skb) && state != CAN_STATE_BUS_OFF) {
 		cf->can_id |= CAN_ERR_CNT;
 		cf->data[6] = txerr;
 		cf->data[7] = rxerr;
diff --git a/drivers/net/can/usb/kvaser_usb/kvaser_usb_core.c b/drivers/net/can/usb/kvaser_usb/kvaser_usb_core.c
index 7d12776ab63e..dcb0bcbe0565 100644
--- a/drivers/net/can/usb/kvaser_usb/kvaser_usb_core.c
+++ b/drivers/net/can/usb/kvaser_usb/kvaser_usb_core.c
@@ -818,7 +818,8 @@ static int kvaser_usb_init_one(struct kvaser_usb *dev, int channel)
 	init_completion(&priv->stop_comp);
 	init_completion(&priv->flush_comp);
 	init_completion(&priv->get_busparams_comp);
-	priv->can.ctrlmode_supported = CAN_CTRLMODE_CC_LEN8_DLC;
+	priv->can.ctrlmode_supported = CAN_CTRLMODE_CC_LEN8_DLC |
+				       CAN_CTRLMODE_BERR_REPORTING;
 
 	priv->dev = dev;
 	priv->netdev = netdev;
diff --git a/drivers/net/can/usb/kvaser_usb/kvaser_usb_hydra.c b/drivers/net/can/usb/kvaser_usb/kvaser_usb_hydra.c
index 3764b263add3..8e88b5917796 100644
--- a/drivers/net/can/usb/kvaser_usb/kvaser_usb_hydra.c
+++ b/drivers/net/can/usb/kvaser_usb/kvaser_usb_hydra.c
@@ -926,6 +926,42 @@ kvaser_usb_hydra_bus_status_to_can_state(const struct kvaser_usb_net_priv *priv,
 	}
 }
 
+static void kvaser_usb_hydra_change_state(struct kvaser_usb_net_priv *priv,
+					  const struct can_berr_counter *bec,
+					  struct can_frame *cf,
+					  enum can_state new_state)
+{
+	struct net_device *netdev = priv->netdev;
+	enum can_state old_state = priv->can.state;
+	enum can_state tx_state, rx_state;
+
+	tx_state = (bec->txerr >= bec->rxerr) ?
+				new_state : CAN_STATE_ERROR_ACTIVE;
+	rx_state = (bec->txerr <= bec->rxerr) ?
+				new_state : CAN_STATE_ERROR_ACTIVE;
+	can_change_state(netdev, cf, tx_state, rx_state);
+
+	if (new_state == CAN_STATE_BUS_OFF && old_state < CAN_STATE_BUS_OFF) {
+		if (priv->can.restart_ms == 0)
+			kvaser_usb_hydra_send_simple_cmd_async(priv, CMD_STOP_CHIP_REQ);
+
+		can_bus_off(netdev);
+	}
+
+	if (priv->can.restart_ms &&
+	    old_state >= CAN_STATE_BUS_OFF &&
+	    new_state < CAN_STATE_BUS_OFF) {
+		priv->can.can_stats.restarts++;
+		if (cf)
+			cf->can_id |= CAN_ERR_RESTARTED;
+	}
+	if (cf && new_state != CAN_STATE_BUS_OFF) {
+		cf->can_id |= CAN_ERR_CNT;
+		cf->data[6] = bec->txerr;
+		cf->data[7] = bec->rxerr;
+	}
+}
+
 static void kvaser_usb_hydra_update_state(struct kvaser_usb_net_priv *priv,
 					  u8 bus_status,
 					  const struct can_berr_counter *bec)
@@ -951,41 +987,11 @@ static void kvaser_usb_hydra_update_state(struct kvaser_usb_net_priv *priv,
 		return;
 
 	skb = alloc_can_err_skb(netdev, &cf);
-	if (skb) {
-		enum can_state tx_state, rx_state;
-
-		tx_state = (bec->txerr >= bec->rxerr) ?
-					new_state : CAN_STATE_ERROR_ACTIVE;
-		rx_state = (bec->txerr <= bec->rxerr) ?
-					new_state : CAN_STATE_ERROR_ACTIVE;
-		can_change_state(netdev, cf, tx_state, rx_state);
-	}
-
-	if (new_state == CAN_STATE_BUS_OFF && old_state < CAN_STATE_BUS_OFF) {
-		if (!priv->can.restart_ms)
-			kvaser_usb_hydra_send_simple_cmd_async
-						(priv, CMD_STOP_CHIP_REQ);
-
-		can_bus_off(netdev);
-	}
-
-	if (!skb) {
+	kvaser_usb_hydra_change_state(priv, bec, cf, new_state);
+	if (skb)
+		netif_rx(skb);
+	else
 		netdev_warn(netdev, "No memory left for err_skb\n");
-		return;
-	}
-
-	if (priv->can.restart_ms &&
-	    old_state >= CAN_STATE_BUS_OFF &&
-	    new_state < CAN_STATE_BUS_OFF)
-		priv->can.can_stats.restarts++;
-
-	if (new_state != CAN_STATE_BUS_OFF) {
-		cf->can_id |= CAN_ERR_CNT;
-		cf->data[6] = bec->txerr;
-		cf->data[7] = bec->rxerr;
-	}
-
-	netif_rx(skb);
 }
 
 static void kvaser_usb_hydra_state_event(const struct kvaser_usb *dev,
@@ -1078,9 +1084,8 @@ kvaser_usb_hydra_error_frame(struct kvaser_usb_net_priv *priv,
 {
 	struct net_device *netdev = priv->netdev;
 	struct net_device_stats *stats = &netdev->stats;
-	struct can_frame *cf;
-	struct sk_buff *skb;
-	struct skb_shared_hwtstamps *shhwtstamps;
+	struct can_frame *cf = NULL;
+	struct sk_buff *skb = NULL;
 	struct can_berr_counter bec;
 	enum can_state new_state, old_state;
 	u8 bus_status;
@@ -1096,52 +1101,26 @@ kvaser_usb_hydra_error_frame(struct kvaser_usb_net_priv *priv,
 	kvaser_usb_hydra_bus_status_to_can_state(priv, bus_status, &bec,
 						 &new_state);
 
-	skb = alloc_can_err_skb(netdev, &cf);
+	if (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING)
+		skb = alloc_can_err_skb(netdev, &cf);
+	if (new_state != old_state)
+		kvaser_usb_hydra_change_state(priv, &bec, cf, new_state);
 
-	if (new_state != old_state) {
+	if (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING) {
 		if (skb) {
-			enum can_state tx_state, rx_state;
-
-			tx_state = (bec.txerr >= bec.rxerr) ?
-					new_state : CAN_STATE_ERROR_ACTIVE;
-			rx_state = (bec.txerr <= bec.rxerr) ?
-					new_state : CAN_STATE_ERROR_ACTIVE;
-
-			can_change_state(netdev, cf, tx_state, rx_state);
-
-			if (priv->can.restart_ms &&
-			    old_state >= CAN_STATE_BUS_OFF &&
-			    new_state < CAN_STATE_BUS_OFF)
-				cf->can_id |= CAN_ERR_RESTARTED;
-		}
-
-		if (new_state == CAN_STATE_BUS_OFF) {
-			if (!priv->can.restart_ms)
-				kvaser_usb_hydra_send_simple_cmd_async
-						(priv, CMD_STOP_CHIP_REQ);
+			struct skb_shared_hwtstamps *shhwtstamps = skb_hwtstamps(skb);
 
-			can_bus_off(netdev);
+			shhwtstamps->hwtstamp = hwtstamp;
+			cf->can_id |= CAN_ERR_BUSERROR | CAN_ERR_CNT;
+			cf->data[6] = bec.txerr;
+			cf->data[7] = bec.rxerr;
+			netif_rx(skb);
+		} else {
+			stats->rx_dropped++;
+			netdev_warn(netdev, "No memory left for err_skb\n");
 		}
 	}
 
-	if (!skb) {
-		stats->rx_dropped++;
-		netdev_warn(netdev, "No memory left for err_skb\n");
-		return;
-	}
-
-	shhwtstamps = skb_hwtstamps(skb);
-	shhwtstamps->hwtstamp = hwtstamp;
-
-	cf->can_id |= CAN_ERR_BUSERROR;
-	if (new_state != CAN_STATE_BUS_OFF) {
-		cf->can_id |= CAN_ERR_CNT;
-		cf->data[6] = bec.txerr;
-		cf->data[7] = bec.rxerr;
-	}
-
-	netif_rx(skb);
-
 	priv->bec.txerr = bec.txerr;
 	priv->bec.rxerr = bec.rxerr;
 }
diff --git a/drivers/net/can/usb/kvaser_usb/kvaser_usb_leaf.c b/drivers/net/can/usb/kvaser_usb/kvaser_usb_leaf.c
index 6b9122ab1464..6a45adcc45bd 100644
--- a/drivers/net/can/usb/kvaser_usb/kvaser_usb_leaf.c
+++ b/drivers/net/can/usb/kvaser_usb/kvaser_usb_leaf.c
@@ -1120,10 +1120,8 @@ kvaser_usb_leaf_rx_error_update_can_state(struct kvaser_usb_net_priv *priv,
 static void kvaser_usb_leaf_rx_error(const struct kvaser_usb *dev,
 				     const struct kvaser_usb_err_summary *es)
 {
-	struct can_frame *cf;
-	struct can_frame tmp_cf = { .can_id = CAN_ERR_FLAG,
-				    .len = CAN_ERR_DLC };
-	struct sk_buff *skb;
+	struct can_frame *cf = NULL;
+	struct sk_buff *skb = NULL;
 	struct net_device_stats *stats;
 	struct kvaser_usb_net_priv *priv;
 	struct kvaser_usb_net_leaf_priv *leaf;
@@ -1143,18 +1141,10 @@ static void kvaser_usb_leaf_rx_error(const struct kvaser_usb *dev,
 	if (!netif_running(priv->netdev))
 		return;
 
-	/* Update all of the CAN interface's state and error counters before
-	 * trying any memory allocation that can actually fail with -ENOMEM.
-	 *
-	 * We send a temporary stack-allocated error CAN frame to
-	 * can_change_state() for the very same reason.
-	 *
-	 * TODO: Split can_change_state() responsibility between updating the
-	 * CAN interface's state and counters, and the setting up of CAN error
-	 * frame ID and data to userspace. Remove stack allocation afterwards.
-	 */
 	old_state = priv->can.state;
-	kvaser_usb_leaf_rx_error_update_can_state(priv, es, &tmp_cf);
+	if (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING)
+		skb = alloc_can_err_skb(priv->netdev, &cf);
+	kvaser_usb_leaf_rx_error_update_can_state(priv, es, cf);
 	new_state = priv->can.state;
 
 	/* If there are errors, request status updates periodically as we do
@@ -1168,13 +1158,6 @@ static void kvaser_usb_leaf_rx_error(const struct kvaser_usb *dev,
 		schedule_delayed_work(&leaf->chip_state_req_work,
 				      msecs_to_jiffies(500));
 
-	skb = alloc_can_err_skb(priv->netdev, &cf);
-	if (!skb) {
-		stats->rx_dropped++;
-		return;
-	}
-	memcpy(cf, &tmp_cf, sizeof(*cf));
-
 	if (new_state != old_state) {
 		if (es->status &
 		    (M16C_STATE_BUS_OFF | M16C_STATE_BUS_RESET)) {
@@ -1187,11 +1170,20 @@ static void kvaser_usb_leaf_rx_error(const struct kvaser_usb *dev,
 		if (priv->can.restart_ms &&
 		    old_state == CAN_STATE_BUS_OFF &&
 		    new_state < CAN_STATE_BUS_OFF) {
-			cf->can_id |= CAN_ERR_RESTARTED;
+			if (cf)
+				cf->can_id |= CAN_ERR_RESTARTED;
 			netif_carrier_on(priv->netdev);
 		}
 	}
 
+	if (!skb) {
+		if (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING) {
+			stats->rx_dropped++;
+			netdev_warn(priv->netdev, "No memory left for err_skb\n");
+		}
+		return;
+	}
+
 	switch (dev->driver_info->family) {
 	case KVASER_LEAF:
 		if (es->leaf.error_factor) {